R.  Kenk, ?Freshwater triclads (Turbellaria) of North America. II. New or little known species of Phagocata?, Proceedings of the Biological Society of Washington, vol. 83, pp. 13-34, 1970.

E.  Pattée, ?Coefficients thermiques et ecologie de quelques planaires d'eau douce 4: La reproduction de Dugesia gonocephala?, Annales de Limnologie, vol. 6, no. 3, pp. 293-304, 1970.

I. R.  Ball, ?Freshwater triclads (Turbellaria, Tricladida) from the oriental region?, Zoological Journal of the Linnean Society, vol. 49, pp. 271-294, 1970.