1. Achtman M, Wagner M (2008) Microbial diversity and the genetic nature of microbial species. Nat Rev Microbiol 6:431–440
2. Alberti M, Burke DH, Hearst JE (1995) Structure and sequence of the photosynthesis gene cluster. In: Blankenship RE, Madigan MT, Bauer CE (eds) Anoxygenic photosynthetic bacteria. Kluwer, Dordrecht/Boston/London, pp 1083–1106
3. Amesz J (1995) The antenna-reaction center complex of Heliobacteria. In: Blankenship RE, Madigan MT, Bauer CE (eds) Anoxygenic photosynthetic bacteria. Kluwer, Dordrecht, pp 687–697
4. Anagnostidis K, Komárek J (1988) Modern approach to the classification system of the cyanophytes. 3. Oscillatoriales. Arch Hydrobiol/Algol Stud 53(Suppl 80):327–472
5. Angerhofer A, Cogdell RJ, Hipkins MF (1986) A spectral characterization of the light-harvesting pigment-protein complexes from Rhodopseudomonas acidophila. Biochim Biophys Acta 848:333–341