Lake J. A., Rivera M. C. Was the nucleus the first endosymbiont? // Proceedings of the National Academy of Sciences, 1994, V. 91, №8, 2880–2881.
262
Moreira D., Lopez-Garcia P. Symbiosis between methanogenic archaea and δ-proteobacteria as the origin of eukaryotes: the syntrophic hypothesis // Journal of Molecular Evolution, 1998, V. 47, №5, 517–530.