Giannakis Antoniou Parampalli Udaya Lynn Margaret Batten Monitoring Employees' Emails without Violating Their Privacy Right. 46-50 2007 PDCAT http://doi.ieeecomputersociety.org/10.1109/PDCAT.2007.49 conf/pdcat/2007 db/conf/pdcat/pdcat2007.html#AntoniouUB07