1. Barrow, N. J. 1978 N.Z. D.S.I.R. Information series No.134, pp 373–390.
2. Baylis, G. T. S. 1975In Endomycorrhizas. Eds. Sanders, Mosse and Tinker, Academic Press, London.
3. Belyayeva, N. I. 1966 Sov. Soil Sci.2, 218–220.
4. Bowen, G. D. and Bevege, D. I. 1976 Rev. Rural Sci.3, 103–112.
5. Brewster, J. L.et al. 1976 Plant and Soil44, 295–328.