Dirk Westhoff Markus Schneider II Claus Unger Firoz Kaderali Methods for Protecting a Mobile Agent's Route. 57-71 1999 conf/isw/1999 ISW http://link.springer.de/link/service/series/0558/bibs/1729/17290057.htm db/conf/isw/isw1999.html#WesthoffSUK99