Baitimirova, Ekaterina, and Tatiana Melnikova. “Interpopulation Variability of the Urinal Sperm of the Moor Frog (<em>Rana arvalis< Em> Nilsson, 1842)”. Biological Communications, no. 3, Sept. 2016, pp. 20–24, doi:10.21638/11701/spbu03.2016.304.