Ultrastructure of the spines in the copulatory organ of some Monocelididae (Turbellaria, Proseriata)
Martens, E.E. (1983). Ultrastructure of the spines in the copulatory organ of some Monocelididae (Turbellaria, Proseriata), in: FKFO Project 2.9007.82. Systematiek en ecologie van mariene organismen: verslag over het tweede werkingsjaar 1983. pp. 109-119