Böhme, M. U., U. Fritz, T. Kotenko, G. Džukić, K. Ljubisavljević, N. Tzankov, T. U. Berendonk. 2007. Phylogeography and cryptic variation within the Lacerta viridis complex (Lacertidae, Reptilia). — Zoologica Scripta, 36: 119—131.
Westerström A., B. Petrov, N. Tzankov. 2010. Envenoming following bites by the Balkan adder Vipera berus bosniensis — first documented case series from Bulgaria. — Toxicon, 56: 1510—1515.
Lukanova, S., N. Tzankov, D. Simeonovska-Nikolova (submitted). A comparative study of the mating call of Pelophylax ridibundus (Pallas, 1771) and Pelophylax kurtmuelleri (Gayda, 1940) from syntopic and allotopic populations. — Journal of natural history.
Lukanova, S., N. Tzankov, D. Simeonovska-Nikolova (submitted). Inter-population study of the mating call of the marsh frog Pelophylax ridibundus (Pallas 1771) in Bulgaria. — Acta zoological bulgarica.
Wielstra, B., Crnobrnja-Isailović J., Litvinchuk S.N., Reijnen B., Skidmore A.K., Sotiropoulos K., Toxopeus A.G., Tzankov N., Vukov T., Arntzen J.W. (submitted). Tracing glacial refugia of Triturus newts based on mitochondrial DNA phylogeography and species distribution modeling. — Frontier in zoology.
Tzankov N., A. Stoyanov. 2008. Triturus cristatus (Laurenti, 1768): a new species for Bulgaria from its southernmost known localities. — Salamandra, 44 (3): 153—162.
Lukanov, S., D. Simeonovska-Nikolova, N. Tzankov. 2011. Habitat distribution and vocal activity of the marsh frog (Pelophylax ridibundus), the European green toad (Pseudepidalea viridis) and the eastern spadfoot (Pelobates syriacus) (Anura: Ranidae, Bufonidae, Pelobatidae) in the protected area of Rupite. — Science & Technologies, Natural & Mathematical science 1 (3): 16—20.
Natchev N., N. Tzankov, R. Gemel. 2011. Green frog invasion in the Black Sea: habitat ecology of the Pelophylax esculentus complex (Anura, Amphibia) population in the region of Shablenska ?uzla lagoon in Bulgaria. — Herpetology Notes, 4: 347—351.
Stoyanov, A., N. Tzankov, B. Naumov. 2011. Die Amphiben und Reptilien Bulgariens. Chimaira, Frankfurt am Main, 588 pp.
Tzankov N., G. Popgeorgiev, S. Mihov. 2007. Yellow-bellied Toad Bombina variegata (Linnaeus, 1758), Species report. Wildlife and sustainable farming initiative, Initiative launched by the European Commission — DG ENV. Orbicon (Denmark), Écosphère (France), Atecma (Spain), Ecosystems LTD (Brussels). 46 pp.
Kornilev Y., N. Tzankov, G. Popgeorgiev. 2010. Modeling the distribution of Vipera ammodytes and V. berus in Bulgaria using ecological modeling techniques and GIS. 43—44 pp. — Marco A.L. Zuffi (Editor). — 3rd Biology of the Vipers Conference — Calci, Pisa, 31st March—2nd April 2010. Museum Natural History and Territory, University of Pisa, Italy. 63 pp.
Lukanov, S., N. Tzankov, D. Simeonovska-Nikolova. 2012. A comparative study of the mating call of the marsh frog Pelophylax ridibundus (Pallas 1771) in Bulgaria. Annual Zoological Congress of ‘Grigore Antipa’ Museum, 22—23 November, 2012, Book of Abstracts: 181. ISBN: 978-606-92462-7-6.