Vergilov, V., Tzankov, N., Kornilev, Y., Popgeorgiev, G., 2022. Ecology of the small Snake-eyed Skink Ablepharus kitaibelii (Bibron & Bory de Saint-Vincent, 1833) in a NW Bulgaria population. — The North-Western Journal of Zoology, 18 (1): 40—46. [PDF]
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]
Demerdzhiev, D., Dobrev, D., Popgeorgiev, G., Stoychev, S., 2022. Landscape alteration affects the demography of an endangered avian predator by reducing the habitat quality. — Avian Research, 13, Article 100030. doi:10.1016/j.avrs.2022.100030 [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.
Kornilev, Y., Lukanov, S., Pulev, A., Slavchev, M., Vacheva, E., Vergilov, V., Mladenov, V., Georgieva, R., Popgeorgiev, G., 2020. The Alien Pond Slider Trachemys scripta (Thunberg in Schoepff, 1792) in Bulgaria: Future Prospects for an Established and Reproducing Invasive Species. — Acta zoologica bulgarica, 72 (4): 571—581.
Shurulinkov, P., Hubenov, Z., Beshkov, S., Popgeorgiev, G. (eds), 2019. Biodiversity of the Bulgarian-Romanian section of the Lower Danube. — Nova Publishers, New York, 441 pp.
Popgeorgiev, G., Naumov, B., Kornilev, Y., Vergilov, V., Slavchev, M., Lukanov, S., Dyugmegdzhiev, A., Stoyanov, A., Dobrev, D., Tzankov, N., 2019. Diversity and Distribution of Amphibians and Reptiles in the Bulgarian Part of the Lower Danube. — p. 283—314.
Demerdzhiev, D., Popgeorgiev, G., Dobrev, D., Arkumarev, V., Terziev, N., 2019. Habitat Requirements of the Lesser Spotted Eagle Clanga pomarina Brehm, 1831 (Aves: Accipitridae) at the Southern Periphery of the Distribution Range (Southeast Bulgaria). — Acta Zoologica Bulgarica, Suppl. 14: 35—65. [PDF]
Zhelev, Z. M., Tsekov, A. G., Popgeorgiev, G. S., Angelov, M. V., Boyadzhiev, P. S., Stefanov, T. R., 2018. Ichthyofauna in the Lower Course of the Sazliyka River, Southern Bulgaria: Composition, Diversity, Seasonal Dynamics and Conservation Significance. — Acta zoologica bulgarica, 70 (3): 331—338.