Спасов, Н., Илиев, Н., (in press). Бележки върху животинските костни останки от ранните разкопки (1956—1959) на къснохалколитния обект при Хотница. — В: Ст. Чохаджиев (под редакцията на). Хотница — праисторическа селищна могила. т. I. (2006). Търново.
Spassov, N., Iliev, N., (in press). Analyses of the bones from domestic and wild mammals from the Bronze Age settlement near Baley. — In: St. Alexandrov (ed.). Baley, the settlement from the Late Bronze age. Sofia.
Spassov, N., Georgiev, K., Ivanova, N., Ivanov, V., (in press). Study on the status of the marbled polecat (Vormela peregusna peregusna Guld.) in Southern Dobrudja (Bulgaria). — Bull. of the Mustelidae, Viverridae & Procyonidae group IUCN/SSC.
Spassov, N., Georgiev, K., Ivanov, V., (in press). The Population Status and Dynamics of the Brown Bear (Ursus arctos L.) on the Cross-Border Region between Bulgaria and Greece. — Bull. of the Belgrade Mus. of Nat. Hist.
Спасов, Н., Илиев Н., Боев, З., (in press). Животинските останки от ранно-неолитното селище край с. Капитан-Димитриево ( Пазарджишка област). — В: В. Николов и др. Селищна могила Капитан Димитриево. Разкопки 2001—2005. Под ред. на В. Николов. София, 2011.
Boev, Z., Nedyalkov, N., Georgiev, D., Spassov, N., 2024. Late Pleistocene birds and mammals from the Kiliite Cave (Central Stara Planina Mts — Central North Bulgaria). — Geologica Balcanica, 53 (1) : 105—115. [PDF]
Konstantinov, Y., Spassov, N., Acosta-Pankov, I., 2022. First records of golden jackal and European badger non-antagonistic interaction at the Lower Danube (Bulgaria). — North-Western Journal of Zoology, 18 (1): 100—103.
Spassov, N., Askerov, E., Ignatov, A., Acosta-Pankov, I., 2021. New data on the status of the jungle cat (Felis chaus Schreber, 1777) in Azerbaijan. — Historia naturalis bulgarica, 42: 1—3. doi:10.48027/hnb.42.011
Yaneva, M., Konyovska, R., Garevska, B., Hristova, L., Spassov, N., 2020. Sedimentary study of the Upper Miocene fossiliferous deposits in the Tikvesh Basin, Republic of North Macedonia. — Comptes rendus de l’Académie bulgare des Sciences, 73 (4): 516—520. doi:10.7546/CRABS.2020.04.10
Nikolov, V., Dochev, D., Pavlishina, P., Brusatte, S., Yaneva, M., Konyovska, R., Vergilov, V., Simov, N., Spassov, N., Hristova, L., 2020. Welcome to “Cretaceous Park”: Three years of research at the Late Cretaceous tetrapod fossil site near the town of Tran, Western Srednogorie. — Review of the Bulgarian Geological Society, 81 (3): 141—143.
Karastoyanova, N., Gorczyk, J., Spassov, N., 2020. The natural history of the fallow deer, Dama dama (Linnaeus, 1758) in Bulgaria in prehistory and new evidence for the existence of an autochthonous Holocene population in the Balkans. — Intеrnational Journal of Osteoarchaeology, 30 (5): 616—628. doi:10.1002/oa.2886
Frémondeau, D., Ottoni, C., Ivanova, S., Marinova, E., Spassov, N., Hristova, L., Konyovska, R., Van Neer, W., Lupianez, N, Gurova, M., 2020. New mtDNA and Isotopic Evidence on Late Pleistocene Cave Bears in the Balkans: the Case-study of Magura Cave, NW Bulgaria. — Acta Zoologica Bulgarica, 72 (3): 461—478.
Yankova, I., Marinov, M., Neov, B., Petrova, M., Spassov, N., Hristov, P., Radoslavov, G., 2019. Evidence for Early European Neolithic Dog Dispersal: New Data on Southeastern European Subfossil Dogs from the Prehistoric and Antiquity Ages. — Genes, 10 (10): 757. doi:10.3390/genes10100757
Spassov, N., Geraads, D., Hristova, L., Markov, G. N., 2019. The Late Miocene (Turolian) mammal fauna from Gorna Sushitsa, Southwestern Bulgaria. — Neues Jahrbuch für Geologie und Paläontologie, 291 (3): 317—350.
Spassov, N., Askerov, E., Akosta-Pankov, I., Ignatov, A., 2019. New data on the occurrence of Panthera pardus in the Talysh Mountains, Azerbaijan (Carnivora: Felidae). — Lynx, series nova, 50.
Spassov, N., Acosta-Pankov, I., 2019. Dispersal history of the golden jackal (Canis aureus moreoticus Geoffroy, 1835) in Europe and possible causes of its recent population explosion. — Biodiversity Data Journal, 7: e34825. doi:10.3897/BDJ.7.e34825
Nishita, Y., Spassov, N., Peeva, S., Raichev, E. G., Kaneko, Y., Masuda, R., 2019. Genetic diversity of MHC class II DRB alleles in the marbled polecat, Vormela peregusna, in Bulgaria. — Ethology Ecology & Evolution, 31 (1): 59—72. doi:10.1080/03949370.2018.1486887
Ersmark, E., Baryshnikov, G., Higham, T., Argant, A., Castaños, P., Döppes, D., Gasparik, M., Germonpré, M., Lidén, K., Lipecki, G., Marciszak, A., Miller, R., Moreno‐García, M., Pacher, M., Robu, M., Rodriguez-Manuel Rojo Guerra, R., Sabol, M., Spassov, N., Storå, J., Valdiosera, C., Villaluenga, A., Stewart, J. R., Dalén, L., 2019. Genetic turnovers and northern survival during the last glacial maximum in European brown bears. — Ecology and Evolution, 9 (10): 5891—5905. doi:10.1002/ece3.5172
Böhme, M., Spassov, N., Fuss, J., Tröscher, A., Deane, A. S., Prieto, J., Kirscher, U., Lechner, T., Begun, D. R., 2019. A new Miocene ape and locomotion in the ancestor of great apes and humans. — Nature. doi:10.1038/s41586-019-1731-0
Boev, Z., Spassov, N., 2019. Past distribution of Castor fiber in Bulgaria: fossil, subfossil and historical records (Rodentia: Castoridae). — Lynx, n. s. (Praha), 50: 37—49. [PDF]
Spassov, N., Iliev, N., Hristova, L., Ivanov, V., 2018. Typology of Thracian horses according to osteological analysis of skeletal remains and depictions from the antiquity. — Historia naturalis bulgarica, 25: 15—24. [PDF] doi:10.5281/zenodo.4043992
Spassov, N., Hristova, L., Iliev, N., 2018. The domesticated horses from the submerged prehistoric village of Urdoviza (Kiten) on the Bulgarian Black Sea coast — among the oldest known. — Historia naturalis bulgarica, 25: 11—14. [PDF] doi:10.5281/zenodo.4043978
Spassov, N., Hristova, L., 2018. Early Ursus etruscus Cuvier from the Middle Villafranchian carst cavern locality of Varshets (Bulgaria). — 24th International Cave Bear Symposium 2018, Chepelare, 27—30.09.2018.
Spassov, N., Geraads, D., Hristova, L., Markov, G. N., Garevska, B., Garevski, R., 2018. The late Miocene mammal faunas of the Republic of Macedonia (FYROM). — Palaeontographica A., 311 (1—6): 1—85.
Mennecart, B., Geraads, D., Spassov, N., Zagorchev, I., 2018. Discovery of the oldest European ruminant in the late Eocene of Bulgaria: Did tectonics influence the diachronic development of the Grande Coupure? — Palaeogeography, Palaeoclimatology, Palaeoecology, 498: 1—8.
Гюрова, М., Иванова, С., Маринова, Е., Попов, В., Спасов, Н., Христова, Л., Ферхейден, С., Бурле, К., 2018. Проучване на пещерата Мишин камик — сезон 5. — Археологически открития и разкопки през 2017 г. БАН. Национален археологически институ с музей. София, с. 8—11.
Fuss, J., Spassov, N., Böhme, M., Begun, D. R., 2018. Response to Benoit and Thackeray ‘A cladistic analysis of Graecopithecus’. — South African Journal of Science, 114 (5/6): Art. #a0267, 2 pp. doi:10.17159/sajs.2018/a0267
Dzhebir, G., Yordanov, G., Yankova, I., Sirakova, D., Petrova, M., Neov, B., Hristov, P., Radoslavov, G., Hristova, L., Spassov, N., 2018. Comparative genetic analysis of subfossil wild horses (from the Neolithic Age and Early Bronze Age) and present-day domestic horses from Bulgaria. — Historia naturalis bulgarica, 25: 3—10. [PDF] doi:10.5281/zenodo.4043974
Dzhebir, G., Yordanov, G., Yankova, I., Sirakova, D., Petrova, M., Neov, B., Hristov, P., Radoslavov, G., Hristova, L., Spassov, N., 2018. Comparative genetic analysis of modern and ancient horses from the Neolithic age in Bulgaria. — Historia naturalis bugarica, 28: 3—10.
Böhme, M., Van Baak, C. G., Prieto, J., Winklhofer, M., Spassov, N., 2018. Late Miocene stratigraphy, palaeoclimate and evolution of the Sandanski Basin (Bulgaria) and the chronology of the Pikermian faunal changes. — Global and planetary change, 170: 1—19.
Acosta-Pankov, I., Spassov, N., Banea, O. C., 2018. Seasonal differences in golden jackals (Canis aureus L. 1758) howling response in Eastern Bulgaria. — Proceedings of the 2nd International Jackal Symposium, Marathon Bay, Attiki Province, Greece, Hell. Zool. Arch., No. 9. ISSN: 1106-2134.
Acosta-Pankov, I., Spassov, N., Banea, O. C., 2018. Seasonal Differences in Howling Response of Golden Jackals Canis aureus L. 1758 (Mammalia: Canidae) in Eastern Bulgaria. — Acta zoologica bulgarica, 70 (4): 539—545.
Acosta-Pankov, I., Ranc, N., Spassov, N., Banea, O. C., 2018. Preliminary results on population density of golden jackals in Bulgaria. — Proceedings of the 2nd International Jackal Symposium, Marathon Bay, Attiki Province, Greece, Hell. Zool. Arch., No. 9. ISSN: 1106-2134.
Spassov, N., Hristova, L., Ivanova, S., Georgiev, I., 2017. First record of the small cave bear in Bulgaria and the taxonomic status of bears of the Ursus savini Andrews — Ursus rossicus Borissiak group. — Fossil imprint, 73 (3—4): 275—291.
Spassov, N., Hristova, L., Ivanova, S., Georgiev, I., 2017. First Record of the ‘Small Cave Bear’ in Bulgaria and taxonomic status of the bears of the Ursus savini Andrews — Ursus rossicus Borissiak group. — Fossil Imprint, 73 (3—4): 275—291.
Spassov, N., Böhme, M., Geraads, D., Kötter, S., Van Baak, C., 2017. Pikermian mammal event, post-Pikermian mammal turnover and appearance of Graecopithecus. — 5th Congress of the RCMNS. September 03—06.2017. Book of Abstracts, p. 21.
Ottoni, C., Van Neer, W., De Cupere, B., Daligault, J., Guimaraes, S., Peters, J., Spassov, N., Prendergast, M. E., Boivin, N., Morales-Muñiz, A., Bălăşescu, A., Becker, C., Benecke, N., Boroneant, A., Buitenhuis, H., Chahoud, J., Crowther, A., Llorente, L., Manaseryan, N., Monchot, H., Onar, V., Osypińska, M., Putelat, O., Quintana Morales, E. M., Studer, J., Wierer, U., Decorte, R., Grange, T., Geigl, E.-M., 2017. The palaeogenetics of cat dispersal in the ancient world. — Nature Ecology & Evolution, 1 (7): 1—7.
Mizumachi, K., Nishita, Y., Spassov, N., Raichev, E. G., Peeva, S., Kaneko, Y., Masuda, R., 2017. Molecular phylogenetic status of the Bulgarian marbled polecat (Vormela peregusna, Mustelidae, Carnivora), revealed by Y chromosomal genes and mitochondrial DNA sequences. — Biochemical Systematics and Ecology, 70: 99—107. doi:10.1016/j.bse.2016.10.025
Milchev, B., Spassov, N., 2017. First evidence for carrion—feeding of Eurasian Eagle-owl (Bubo bubo) in Bulgaria. — Ornis Hungarica, 25 (1): 58—69.
Li, Y., Spassov, N., 2017. A new species of Paramachaerodus (Mammalia, Carnivora, Felidae) from the late Miocene of China and Bulgaria, and revision of Promegantereon Kretzoi, 1938 and Paramachaerodus Pilgrim, 1913. — Paläontologische Zeitschrift, 3 (91): 409—426. doi:10.1007/s12542-017-0371-7
Гюрова, М., Иванова, С., Спасов, Н., Христова, Л., Попов, В., Маринова, Е., Бьоме, М., 2017. Проучване на пещерата Мишин камик — сезон 4. — Археологически открития и разкопки през 2016 г. БАН. Национален археологически институ с музей. С??фия, с. 48—50.
Gurov, T., Atanassov, E., Karaivanova, A., Serbezov, R., Spassov, N., 2017. Statistical Estimation of Brown Bears (Ursus arctos L.) Population in the Rhodope mountains. — Procedia Computer Science 108C (2017): 2028—2037.
Fuss, J., Spassov, N., Begun, D., Böhme, M., 2017. Potential hominin affinities of Graecopithecus from the Late Miocene of Europe. — PlosOne, 12: e0177127.
Böhme, M., Spassov, N., Ebner, M., Geraads, D., Hristova, L., Kirscher, U., Kötter, S., Linnemann, U., Prieto, J., Roussiakis, S., Theodorou, G., Uhlig, G., Winklhofer, M., 2017. Messinian Age and savanna environment of the possible hominin Graecopithecus from SE Europe. — PlosOne, 12 (5): e0177347. doi:10.1371/journal.pone.0177347
Böhme, M., Spassov, N., Ebner, M., Geraads, D., Hristova, L., Kirscher, U., Kötter, S., Linnemann, U., Prieto, J., Roussiakis, S., Theodorou, G., Uhlig, G., Winklhofer, M., 2017. Messinian Age and savanna environment of the possible hominin Graecopithecus from SE Europe. — PLoS One, 12 (5): e0177347. doi:10.1371/journal.pone.0177347
Böhme, M., Spassov, N., Ebner, M., Geraads, D., Hristova, L., Kirscher, U., Kötter, S., Linnemann, U., Prieto, J., Roussiakis, S., Theodorou, G., Uhlig, G., Winklhofer, M., 2017. Environment and stratigraphy of the classical Pikermi sites and post-Pikermian localities and the first, Late Miocene, Sahara desertification. — 15th Congress of the R.C.M.N.S. ‘Exploring a physical laboratory: the Mediterranean Basin’, 3—6 September 2017, Athens, Abstracs, p. 31.
Böhme, M., Kötter, S., Fuss, J., Uhlig, G., Spassov, N., 2017. The diet of Graecopithecus freybergi: phytoliths and dentognathic evidence. — 5th Congress of the RCMNS. September 03—06.2017. Book of Abstracts.
Spassov, N., Spiridonov, G., Ivanov, V., Assenov, L., 2016. Bear footprints and their use for monitoring and estimating numbers of brown bears (Ursus arctos L.) in Bulgaria. — Historia naturalis bulgarica, 23: 119—126. [PDF] doi:10.5281/zenodo.4043917
Spassov, N., Ivanov, V., 2016. Home range, movements and activity patterns of an exceptionally large male Brown Bear (Ursus arctos L.) in the area of the Bulgarian-Greek border (Western Rhodope Mts.). — ZooNotes 89: 1—3.
Spassov, N., Ignatov, A., Acosta-Pankov, I., 2016. On the status of the leopard in Turkey, again. — Cat news No 64, Autumn 2016, ISSN 1027-2992.