1. Studien über die ersten Entwicklung vorgange des Eizelle die Zell theilung und die conjugation der Infusorien;Bütschli;Abb. Seuckenb. naturf. Ges.,1876
2. The paedogamous conjugation of Blepharisma undulans;Calkins;J. Morphol.,1912
3. Size and conjugation in Blepharisma;Giese;Arch. Protistenk.,1938
4. The role of starvation in conjugation of Paramecium;Giese;Physiol. Zool.,1938
5. Diverse races of Paramecium and their relation to selection and to conjugation;Jennings;Science,1909