@article {1726, title = {Spermatogenesis, spermiogenesis and sperm structure in Crenobia (Planaria) alpina (Dana)}, journal = {Z Zellforsch Mikrosk Anat}, volume = {97}, year = {1969}, month = {1969}, pages = {549-63}, keywords = {Animals, Cell Division, Cell Nucleus, Cytoplasm, Flagella, Male, Microscopy, Phase-Contrast, Spermatozoa, Staining and Labeling, Turbellaria}, issn = {0340-0336}, author = {van der Linden, A G} } @article {1701, title = {Oblique illumination and interference contrast microscopy aids in the taxonomic histology of land planarians.}, journal = {Mikroskopie}, volume = {34}, year = {1978}, month = {1978 Dec}, pages = {319-21}, keywords = {Animals, Microscopy, Interference, Microscopy, Phase-Contrast, planarians, Turbellaria}, issn = {0026-3702}, author = {Winsor, L} }