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Rieger, R. M.; Sterrer, W. (1975). New spicular skeletons in Turbellaria, and the occurrence of spicules in marine meiofauna. Z zool Syst Evolutionsforsch. 13:207-278.
Rieger, R. M.; Sterrer, W. (1975). New spicular skeletons in Turbellaria, and the occurrence of spicules in marine meiofauna. Z zool Syst Evolutionsforsch. 13:207-278.