1. Allen, O. N., Allen E. K., 1981: The Leguminosae. Madison, Wisconsin: Univ. of Wiscons in Press.
2. Appleby, C. A., 1974: Leghemoglobin. In: The Biology of Nitrogen Fixation. Quispel, A. (Ed.), New York: Elsevier Pub. Co. Inc, pp. 521–554.
3. Appleby, C. A., Turner, G. L., MacNichol, P. K., 1975a: Involvement of oxyleghaemoglobin and cytochromome P-450 in an efficient oxidative phosphorylation pathway which support nitrogen fixation in Rhizobium. Biochim. Biophys. Acta 387, 461–475.
4. Appleby, C. A., Nicola, N. A., Hurrell, J. G. R., Leach, S. J., 1975b: Characterization and improved separation of soybean leghaemoglobin. Biochemistry 14, 4444–4450.
5. Appleby, C. A., Tjepkema, J. D., Trinick, M. J., 1983: Hemoglobin in a nonleguminous plant, Parasponia. Possible genetic origin and function in nitrogen fixation. Science 220, 951–953.