Reference

Anne Fleury, F. Iftode, Ghislaine Fryd-Versavel, J.-J. Curgy, J. Génermont (1983): Stable and unstable morphological states generated by cadmium treatment and heat shocks in Euplotes (Ciliata Hypotrichida) with some reference to Tetrahymena pyriformis (Ciliata Hymenostomatida) – Protistologica – 19: 577 - 586.