A hierarchical framework model of mobile security. - Jun-Zhao Sun; Douglas Howie; Antti Koivisto; Jaakko J. Sauvola (PIMRC, 2002)

Harnessing SIP for autonomous mobile peer-to-peer networking. - Douglas Howie; Erkki Harjula; Jussi Ala-Kurikka; Mika Ylianttila (GLOBECOM, 2005)

Analysis of Peer-to-Peer SIP in a Distributed Mobile Middleware System. - Erkki Harjula; Jussi Ala-Kurikka; Douglas Howie; Mika Ylianttila (GLOBECOM, 2006)