1. Sperm collection and processing methods: a practical guide;Jeyendran,2003
2. WHO manual for the standardized investigation, diagnosis, and management of the infertile male;Rowe,2000
3. Effects of ejaculatory frequency and season on variations in semen quality;Carlsen;Fertil Steril,2004
4. WHO laboratory manual for the examination of human semen and sperm–cervical mucus interaction,1999
5. Male fertility and sexual function after spinal cord injury;Brown;Prog Brain Res,2006