Revisiting Reachability Management as a Multilateral Security Mechanism. - Jacobus A. Ophoff; Reinhardt A. Botha (ISSA, 2005)

Privacy-enhancing Call Management in an IP-based Infrastructure. - Jacobus A. Ophoff; Reinhardt A. Botha (ICWMC, 2006)

A Model for Secure Value-Added Service Subscriptions in Cellular Networks. - Jacobus A. Ophoff; Stephen Perelson; Reinhardt A. Botha (ISSA, 2006)

Mobile communications: user perception and practice. - Jacobus A. Ophoff; Reinhardt A. Botha (South Afr. Comput. J., 2008)