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
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., 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
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.