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Padmavathi, P. B. (1959) Chromatographic analysis of the vegetative and binary fission stages of spirostomum ambigumm Mull-Ehrbg. Science of Nature, 46 (8). p. 269.
Vasanthi Bhandary, A (1959) Cytology of an Indian Race of Blepharisma Undulans (Stein). Journal of Eukaryotic Microbiology, 6 (4). pp. 333-339.