1. Methanogens: reevaluation of a unique biological group;Balch;Microbiol. Rev.,1979
2. Modern microbiological formation of methane in the quarternary and pliocene rocks of the Caspanian Sea;Belyaev;Geochem. Int.,1977
3. Methanococcus igneus sp. nov., a novel hyperthermophilic methanogen from a shallow submarine hydrothermal system;Burggraf;System. Appl. Microbiol.,1990
4. Microenvironments for sulfate reduction and methane production in freshwater sediments;Cappenberg,1978
5. The origin and distribution of methane in marine sediments;Claypool,1974