1. Alberts B, Johnson A, Lewis J, Raff M, Roberts K, Walter P (2002) Molecular biology of the cell, 4th edn. Garland Science, New York
2. Canefield DE (1998) A new model for Proteozoic ocean chemistry. Nature 396:450–453
3. Cavalier-Smith T (1983) Endosymbiotic origin of the mitochondrial envelope. In Schwemmler W, Schenck HEA (ed) Endocytobiology II. de Gruyter, Berlin, pp 265–279
4. Dolan MF (2002) Speciation of termite gut protists: the role of bacterial symbionts. Inter Microbiol 4:203–208
5. Dolan MF (2011) The wood-eating termite hindgut: diverse cellular symbioses in a microoxic to anoxic environment. In Seckbach J et al. (ed) Anoxia. Springer, New York