Pope CF, Hay P, Alexander S, Capaldi K, Dave J, Sadiq ST, Ison CA, Planche T. Positive predictive value of the Becton Dickinson VIPER system and the ProbeTec GC Q x assay, in extracted mode, for detection of Neisseria gonorrhoeae. Sex Transm Infect. 2010 Nov;86(6):465-9.
Alexander S. and Anderson M. The laboratory diagnosis and point of care tests for STIs. The ABC of STIs. 6th Edition. BMJ Books.
Alexander S, Tosswill J, Ison CA. Laboratory diagnosis of sexually transmitted infections Medicine (2010).