1. Organic forms of nitrogen;Bremner,1965
2. Plant recovery of immobilized nitrogen in greenhouse experiments;Broadbent,1965
3. Laboratory and greenhouse investigations of nitrogen immobilization;Broadbent,1962
4. Chemical distribution of added nitrogen in soils;Cheng,1963
5. The Determination of Mineral Nitrogen in Soil with Particular Reference to Nitrate;Freney;CSIRO, Division of Plant Industry Technical Paper No. 23,1967