1. Techniques for the enrichment, isolation and maintenance of the photosynthetic bacteria;Van Niel,1971
2. Isolation of members of the families Chromatiaceae and Chlorobiaceae;Pfennig,1981
3. Media for anaerobic growth of photosynthetic bacteria;Bose,1963
4. Long-term preservation of phototrophic bacteria;Biebl,1976
5. Über das Vitamin B 12 Bedürfnis phototropher Schwefelbakterien;Pfennig;Arch. Mikrobiol.,1966