Żbikowski, Janusz, et al. “Reproduction of Potamothrix Hammoniensis (Oligochaeta) in Shallow Eutrophic Lakes”. Oceanological and Hydrobiological Studies, vol. 47, no. 2, June 2018, pp. 181-9, https://czasopisma.bg.ug.edu.pl/index.php/oandhs/article/view/8622.