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- [28] EFFECTS OF VITAMIN-A, VITAMIN-D3, VITAMIN-E AND VITAMIN-C ON THE CHARACTERISTICS OF BULL SEMEN ZENTRALBLATT FUR VETERINARMEDIZIN REIHE A-JOURNAL OF VETERINARY MEDICINE SERIES A-ANIMAL PHYSIOLOGY PATHOLOGY AND CLINICAL VETERINARY MEDICINE, 1981, 28 (07): : 538 - 546