SUSILOWATI, S. BIOAKTIVITAS INSULIN LIKE GROWTH FACTOR–I COMPLEX PLASMA SEMINALIS KAMBING TERHADAP KUALITAS SPERMATOZOA HASIL SENTRIFUGASI. BERKALA PENELITIAN HAYATI JOURNAL OF BIOLOGICAL RESEARCHES, v. 12, n. 2, p. 167-171, 5 Feb. 2012.