References
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- British Compressed Gases Association (BCGA). BCGA code of practice. The safe use of liquid nitrogen dewars up to 50 litres. BCGA, DerbyEngland 2000
- Human Fertilisation and Embryology Authority (HFEA). Chairs letter CH(04)03. Guidelines on the safety of equipment used to store cryopreserved gametes and embryos in assisted reproduction laboratories. HFEA, London 2004
- Kim L. U., Johnson M. R., Barton S., et al. Evaluation of sperm washing as a potential method of reducing HIV transmission in HIV-discordant couples wishing to have children. AIDS 1999; 16: 645–651