Trafficking in women from Nigeria to Europe / Migration Information Source, 1 July 2005

http://www.migrationinformation.org/Feature/display.cfm?id=318
Jørgen Carling
"The Western European prostitution market has become increasingly globalised during the past 15 years. The largest group of prostitutes from Sub-Saharan Africa comes from Nigeria, and they are usually recruited through a specific type of trafficking network."