1. Bosu, W. T. K., L.-E. Edquist, P. Lindberg, K. Martinsson & E. D. B. Johansson: The effect of various dosages of lynestrol on the plasma levels of oestrogens and progesterone during the menstrual cycle in the rhesus monkey. Contraception 1976, 13, 677–684.
2. Castellanos, R. C.: Evaluation of a progesterone radioimmunoassay and its application in Cuban cattle. Dep. of Clinical Chemistry, Faculty of Veterinary Medicine, Swedish University of Agricultural Sciences, Uppsala, Sweden. Report 1, 1979, pp. 1–61.
3. Delahaut, P., J. F. Beckers & F. Ectors: Effect de l’azide de sodium sur la dégradation de la progesterone dans les échantillons de sang total chez les bovins. (Effect of sodium azide on progesterone degradation in bovine whole blood samples). Ann. Méd. vét. 1979, 123, 567–572.
4. Helwig, J. T. & K. A. Council (ed.): SAS User’s Guide. SAS Institute, Inc., Raleigh, N.G. 1979.
5. Holdsworth, R. J.: Measurement of progesterone in bovine plasma and preserved whole blood samples by a direct radioimmunoassay. Brit. vet. J. 1980, 136, 135–140.