Reference

S. Serrano, A. Martin-Gonzalez, Dimas Fernandez-Galiano (1990): General Morphology and Cytological Events during the Conjugation Process in Acaryophrya collaris (Kahl, 1926) (Ciliophora, Haptorina) – Archiv für Protistenkunde – 138_1990: 65 - 74.