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2 De Vos, K, "http://rsb.info.nih.gov/ij/plugins/cell-counter.html"
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6 Watson PF, "The causes of reduced fertility with cryopreserved semen" 60 : 481-492, 2000
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8 Salamon S, "Storage of ram semen" 62 : 77-111, 2000
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