1. Govindjee, E.: Bioenergetics of Photosynthesis. New York: Academic Press 1975
2. Van Niel, C.B.: Photosynthesis of bacteria. In: Contributions to Marine Biology, p. 158. Palo Alto, CA: Stanford University Press 1930
3. Van Niel, C.B.: Bacteriol. Rev. 8, 10 (1944)
4. For a recent review see Clayton, R.K., in: The Photosynthetic Bacteria, Clayton, R.K., Sistrom, W.R (eds.), New York: Plenum Press 1977
5. Goedheer, J.C.: Spectral and redox properties of bacteriochlorophyll in its natural state, Biochim. Biophys. Acta 38, 389–399 (1960)