1. Beevers, L. and Hageman, R.H. (1983) in Encyclopedia of Plant Physiology New Series Vol. 15A (Lauchli, A. and Bieleski, R.L., eds.) pp. 351–375, Springer Verlag, New York, NY.
2. Pate, J.S. (1971) in 15-N and Soil-Plant Studies, pp. 165–187, International Atomic Energy Agency, Vienna.
3. Pate, J.S. (1980) Annu. Rev. Plant Physiol. 31, 313–340.
4. Dalling, M.J., Tolbert, N.E. and Hageman, R.H. (1972) Biochim. Biophys. Acta 283, 505–512.
5. Wallsgrove, R.M., Lea, P.J. and Miflin, B.J. (1979) Plant Physiol. 63, 232–236.