R.  Sluys, ?Sperm resorption in triclads (Platyhelminthes, Tricladida)?, Invertebrate Reproduction and Development, vol. 15, no. 2, pp. 89-95, 1989.

R.  Kenk, ?The planarians (Turbellaria: Tricladida, Paludicola) of Lake Ohrid in Macedonia?, 1978.

T.  Sywula, Krstanovski, Z., Bia?a, A., Wysocka, A., Kilikowska, A., and Sell, J., ?Phylogenetic position of Dendrocoelum lacteum (Tricladida) from the Balkan Lake Ohrid evidenced by allozyme data?, vol. 34, pp. 212 - 218, 2006.