1. Graumann P (ed) (2007) Bacillus: cellular and molecular biology, 1st edn. Caister Academic Press, Haverhill, UK, http://www.horizonpress.com/bac
2. Hansen JN, Spiegelman G, Halvorson HO (1970) Bacterial spore outgrowth: its regulation. Science 168:1291–1298
3. Keynan A (1973) The transformation of bacterial endospores into vegetative cells. Symp Soc Gen Microbiol 23:85–123
4. Mandelstam J (1976) Bacterial sporulation: a problem in the biochemistry and genetics of a primitive developmental system. Proc R Soc B 193:89–106
5. Nelson DL, Kornberg A (1970) Biochemical studies of bacterial sporulation and germination. XVIII. Free amino acids in spores. J Biol Chem 245:1128–1136