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3. Progesterone levels in the bovine peripheral plasma measured by the competitive protein binding technique;Edqvist;Zbl. Vet. Med.,1970
4. Peripheral plasma levels of progesterone and fertility after prostaglandin F2α induced oestrus in heifers;Edqvist;Cornell Vet.,1975
5. HAFS, H.D.: Personal communication, 1976.