1. Amemiya M.: The influence of aggregate size on soil moisture content-capillary conductivity relations.Soil Sci. Soc. Proc. 29, 744–748 (1965).
2. Fred E.B., Waksman S.A.:Laboratory Manual of General Microbiology, p. 10. McGraw-Hill Book Co., New York-London 1928.
3. Gibs B.M., Shapton D.A.:Identification Methods for Microbiologists, Part B, p. 21. Academic Press, London-New York 1968.
4. Hattori T.:Microbial Life in the Soil, pp. 262–312. Marcel Dekken, New York 1973.
5. Hattori T.: Soil aggregates as microhabitat of microorganisms.Rep. Inst. Agric. Res. Tohoku Univ. 37, 23–36 (1988).