M.  Kalafati?, Kopjar, N., and Besendorfer, V., ?The impairments of neoblast division in regenerating planarian Polycelis felina (Daly.) caused by in vitro treatment with cadmium sulfate?, Toxicol In Vitro, vol. 18, no. 1, pp. 99-107, 2004.

T.  LENDER and GABRIEL, A., ?On the distribution of neoblasts of Dugesia lugubris (Turbellaria, Tricladida) before and during regeneration?, C R Hebd Seances Acad Sci, vol. 250, pp. 2465-7, 1960.