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Seshachar, B. R. (1960) Effect of centrifugation on the macro-nucleus of spirostomum and belpharisma. Nature, 186 (4721). pp. 333-334.
Vasanthi Bhandary, A. (1960) Conjugation in Blepharisma undulans americanum. The journal of protozoology, 7 (3). pp. 250-255.