Gerdzhikov, G., Plachiyski, D., Popgeorgiev, G., Avramov, S., Demerdzhiev, D., Daskalova, G., Shurulinkov, P., 2022. White-backed (Lilford’s) Woodpecker Dendrocopos leucotos lilfordi Sharpe & Dresser, 1871: Distribution and Population Density in Bulgaria. — North-Western Journal of Zoology 18 (1): 65—70. Article No.: e211601. [PDF]
Dobrev, D., Dobrev, V., Hristova, P., Popgeorgiev, G., Demerdzhiev, D., Plachyiski, D., 2022. Long-term changes in a Pygmy Cormorant Microcarbo pygmaeus wintering population in Southern Bulgaria. — Acta Ornithol., 57: 143—154. doi:10.3161/00016454AO2022.57.2.003 [PDF]
Plachiyski, D., Popgeorgiev, G., Avramov, S., Kornilev, Y., 2020. Habitat selection of “Мad Cocks” of the Western Capercaillies Tetrao urogallus (Galliformes: Phasianidae) from the fringe of the range: A case study from Rila Mts. (Bulgaria). — Ecologia Balkanica, 12 (1): 155—169.
Naumov, B., Popgeorgiev, G., Kornilev, Y., Plachiyski, D., Stojanov, A., Tzankov, N., 2020. Distribution and Ecology of the Alpine Newt Ichthyosaura alpestris (Laurenti, 1768) (Amphibia: Salamandridae) in Bulgaria. — Acta Zoologica Bulgarica, 72 (1): 83—102.
Plachiyski, D., Popgeorgiev, G., Avramov, S., Boev, Z., 2018. The Balkan Capercaillie Tetrao urogallus rudolfi Dombrowski, 1912 (Galliformes: Phasianidae): Distribution History and Current Status in Bulgaria. — Acta zoologica bulgarica, 70 (1): 101—111. [PDF]
Iankov, P., Petkov, N., Plachiyski, D., Ratarova, V., Vasilev, V., Popgeorgiev, G., 2018. Handbook for identification and conservation of the forest birds. — BSPB, Conservation Series, Book 35. BSPB, Sofia, 203 pp.
Gerdzhikov, G., Georgiev, K., Plachiyski, D., Zlatanov, Tz., Shurulinkov, P., 2018. Habitat Requirements of the White-backed Woodpecker Dendrocopos leucotos lilfordi (Sharpe & Dresser, 1871) (Piciformes: Picidae) in Strandzha Mountain, Bulgaria. — Acta Zoologica Bulgarica, 70 (4): 527—534.
Плачийски, Д., Рътарова, В., Демерджиев, Д., Чешмеджиев, С., Фердинандова, В., Аркумарев, В., Баталов, Д., Василев, Н., 2018. План за действие за малкия креслив орел (Clanga pomarina) в България за периода 2019—2028 г. — БДЗП, ИАГ и МОСВ, София: 88 с.
Shurulinkov, P., Daskalova, G., Avramov, S., Plachiyski, D., Popgeorgiev, G., Gerdzhikov, G., Angelova, K., 2016. Action plan for the Three-toed Woodpecker (Picoides tridactylus) in Bulgaria (2016—2025). — Bulgarian Biodiversity Foundation, Sofia, 57 pp.
Shurulinkov, P., Daskalova, G., Avramov, S., Plachiyski, D., Popgeorgiev, G., Gerdzhikov, G., Angelova, K., 2015. Action plan for the White-backed Woodpecker (Dendrocopos leucotos) in Bulgaria (2016—2025). — Bulgarian Biodiversity Foundation, Sofia, 73 pp.
Popgeorgiev, G., Tzankov, N., Kornilev, Y. V., Plachiyski, D., Naumov, B., Stojanov, A., 2014. Changes in agri-environmental practices pose a threat to the herpetofauna: a case study from Besaparski Ridove Special Protection Area (Natura 2000), southern Bulgaria. — Acta zoologica bulgarica, Supplement 5: 157—169.
Dobrev, V., Popgeorgiev, G., Plachiyski, D., 2014. Effects of the Common Agricultural Policy on the Coverage of Grassland Habitats in Besaparski Ridove Special Protection Area (Natura 2000), Southern Bulgaria. — Acta Zoologica Bulgarica, Supplement 5: 147—155.
Плачийски, Д., Демерджиев, Д., Попгеоргиев, Г., Петков, Н., Корнилев, Ю., 2014. План за действие за опазване на малкия корморан (Phalacrocorax pygmeus) в България (2014—2023 г.). — БДЗП-МОСВ, София: 98 с.
Nikolov, S., Demerdzhiev, D, Popgeorgiev, G., Plachiyski, D., 2011. Bird community patterns in sub-Mediterranean pastures: the effects of shrub cover and grazing intensity. — Animal Biodiversity and Conservation, 34.1: 11—21. [PDF]
Klimentova, I., Plachiyski, D., Georgiev, D., 2011. Preliminary Information on the Vertebrate Fauna (Animalia: Vertebrata) of the NATURA 2000 Site “Rice Fields Tsalapitsa” (Bulgaria). — Ecologia Balkanica, 3 (2): 57—60.
Spiridonov. J., Stoyanov, G., Plachiyski, D., 2007. Western Rhodopes. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 340—342.
Plachiyski, D., Petrov, Tz., Ivanov, B., Velkov, S., Nikolov, I., Nikolov, B., Shurulinkov, P., Stanchev, R., 2007. Maritsa — Plovdiv. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 417—419.
Plachiyski, D., Petkov, N., 2007. Zvanichevo fish-ponds. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 356—358.
Plachiyski, D., 2007. Tsalapitsa rice-fields. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 414—416.
Plachiyski, D., 2007. Plovdiv fish-ponds. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 170—172.
Plachiyski, D., 2007. Persenk. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 464—466.
Petrov, Ts., Demerdzhiev, D., Popgeorgiev, G., Plachiyski, D., Manchev, K., Ivanov, M., 2007. The White Stork (Ciconia ciconia) in Plovdiv District in 2004—2005. — In: Petrov, Ts. (ed) The White Stork (Ciconia ciconia) in Bulgaria, II. BSPB, Conservation Series, Book 12. BSPB, Plovdiv. pp. 165—178. (In Bulgarian with English summary).
Ivanov, B., Plachiyski, D., 2007. Konush reservoir. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 167—169.
Iankov, P., Plachiyski, D., 2007. Pyasachnik reservoir. — In: Кostadinova, I., Gramatikov, M. (eds) Important Bird Areas in Bulgaria and Natura 2000. BSPB, Conservation Series, Book 11. BSPB, Sofia. pp. 149—152.
Popgeorgiev, G., Plachiyski, D., 2006. Conservation of tortoises in Bulgaria. — BSPB, Conservation Series, Book 11. BSPB, Plovdiv. 16 pp.
Petrov, Ts., Demerdzhiev, D., Popgeorgiev, G., Profirov, L., Velev, K., Dimitrova, K., Plachiyski, D., 2006. Birds of Western Rhodopes (Bulgaria and Greece). — In: Beron, P. (ed.) Biodiversity of Bulgaria. 3. Biodiversity of Western Rhodopes (Bulgaria and Greece). I. Pensoft & Nat. Mus. Natur. Hist., Sofia, pp. 913—948. [PDF]