1. Bohlool, B.B., Schmidt, E.L.: Soil Sci. 110, 229–236 (1970).
2. Brockwell, J.: Aust. CSIRO Div. Plant Ind. Fld Stn Rec. 10, 51–58 (1971).
3. Brockwell, J.: In: A Treatise on Dinitrogen Fixation. Section IV. Agronomy and Ecology. Hardy, R.W.F., Gibson, A.H. (ed.). New York: John Wiley and Sons, pp. 277–309 (1977).
4. Brockwell, J., Hely, F.W.: Aust. J. Agric. Res. 17, 885–899 (1966).
5. Brockwell, J., Schwinghamer, E.A., Gault, R.R.: Soil Biol. Biochem. 9, 19–24 (1977).