Konstantinos P. Demestichas Evgenia F. Adamopoulou John G. Markoulidakis Michael E. Theologou 116-134 2009 32 J. Network and Computer Applications 1 http://dx.doi.org/10.1016/j.jnca.2008.04.002 db/journals/jnca/jnca32.html#DemestichasAMT09