1. Buchanon RE, Gibbons NE (1975) Bergey's manual of determinative bacteriology, 8th edn. Williams Company, Baltimore, USA
2. Casselman ME, Patrick WH Jr, Delaune RD (1981) Nitrogen fixation in a Gulf coast salt marsh. Soil Sci Soc Am J 45:51–56
3. Chapman VJ (1975) The salinity problem in general, its importance, and distribution with special reference to natural halophytes. In: Poljakoff Mayber A, Gale J (eds) Plants in saline environments. Springer, Berlin, pp 7–23
4. Dalton H (1980) The cultivation of diazotrophic microorganisms. In: Bergenson FJ (ed.) Methods for evaluating biological nitrogen fixation. John Wiley and Sons Ltd., London, pp 13–64
5. Dewis J, Freitas F (1984) Physical and chemical methods of soil and water analysis. FAO of the United Nations, Rome