S.  Tamura, Oki, I., and Kawakatsu, M., ?A review of chromosomal variation in Dugesia japonica and D. ryukyuensis in the Far East?, Hydrobiologia, vol. 305, pp. 79-84, 1995.

M.  Kawakatsu, Oki, I., and Tamura, S., ?Taxonomy and geographical distribution of Dugesia japonica and D. ryukyuensis in the Far East?, Hydrobiologia, vol. 305, pp. 55-61, 1995.

I.  Oki, Tamura, S., Nishino, M., Takai, M., Kuznedelov, K., Timoshkin, O., and Kawakatsu, M., ?Chromosomes of Phagocata kawakatsui and Bdellocephala annandalei from Lake Biwa-ko in Honshú, central Japan?, Hydrobiologia, vol. 383, pp. 315-320, 1998.

R.  Sluys, Timoshkin, O. A., and Kawakatsu, M., ?A new species of giant planarian from Lake Baikal, with some remarks on character states in the Dendrocoelidae (Platyhelminthes, Tricladida, Paludicola)?, Hydrobiologia, vol. 383, pp. 69-75, 1998.