1. Alexander M (1977) An introduction to soil microbiology. 2nd ed. Wiley, New York, Santa Barbara
2. Allen SE, Grimshaw HM, Parkinson JA, Quarmby C (1974) Chemical analysis of ecological materials, Blackwell, Oxford London
3. Anderson JM (1987) Interactions between invertebrates and microorganisms: noise or necessity for soil processes? In: Fletcher M, Gray TRG, Jones JG (eds) Ecology of microbial communities. Cambridge University Press, Cambridge, pp 125?145
4. Anderson JPE, Domsch KH (1978) A physiological method for the quantitative measurement of microbial biomass in soil. Soil Biol Biochem 17: 197?203
5. Andres E (1984) Kohlenstoff-Umsatz und-Bilanz des Bodens eines Buchenwald-�kosystems auf Kalkgestein. G�tt bodenkundl Ber 80: 1?174