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2. The use of in vitro fertilization in the management of male infertility;De Kretser,1985
3. Pregnancies after human tubal embryo transfer (TET): a new method of infertility treatment;Wong;Singapore J Obstet Gynecol,1988
4. Fertilization of human oocytes by sperm from infertile males after zona pellucida drilling;Gordon;Fertil Steril,1988
5. Transfer of human sperm into the perivitelline space of human oocytes after zona-drilling or zona-puncture;Ng;Fertil Steril,1989