1. The Endosymbiont Hypothesis Revisited;Gray,1992
2. Towards a Natural System of Organisms: Proposal for the Domains Archaea, Bacteria, and Eucarya;Woese,1990
3. Plastid Origins;Howe;Trends Ecol Evol,1992
4. Eukaryote-eukaryote Endosymbioses: Insights from Studies of a Cryptomonad Alga;Douglas;Biosystems,1992
5. Probable Evolutionary History of Cryptomonad Algae;Douglas,1992