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3. Synchronization of Estrus in Heifers with 6-Methyl-17-acetoxy-progesterone and Its Effect on Subsequent Ovulation and Fertility;Collins;J. Dairy Sci.,1961
4. Controlled Estrus in Cattle;Donker,1958
5. Factors Influencing in Vitro Synthesis of Progesterone;Duncan;Endocrinology,1961