1. Abilgaard, U., Scand. J. Clin. Lab. Invest., 21 (1968) 89.
2. Astrup, T. and Darling, S., Acta Physiol. Scand., 5 (1943) 13.
3. Bangham, D.R., in Erythropoiesis, (Ed. Jacobson, L.O. and Doyle, M. ), Grune and Stratton, (1962) p. 23.
4. Bangham, D.R. and Musset, M.V., Bull. Wld. Hlth. Org., 20 (1959) 1201
5. Bangham, D.R. and Woodward, P.M., Bull. Wld. Hlth. Org., 42 (1970) 129.