Епштейн, В. М. “From Morphology to Phylogeny (on the Example of Study of the Fish Leeches of Palearctic)”. The Journal of V.N.Karazin Kharkiv National University. Series «Biology», Vol. 18, no. 1079, May 2013, pp. 144-50, https://periodicals.karazin.ua/biology/article/view/13754.