Grigoryan, A., Karapetyan, A., & Jivanyan, K. (2011). HISTOMORPHOLOGICAL FEATURES OF LAKE FROG`S SKIN ($Rana~ridibunda$), LIVING AT THE HRAZDAN RIVER. Proceedings of the YSU B: Chemical and Biological Sciences, 45(1 (224), 49–52. https://doi.org/10.46991/PYSU:B/2011.45.1.049