Ralph Holz Heiko Niedermayer Peter Hauck Georg Carle Trust-Rated Authentication for Domain-Structured Distributed Systems. 74-88 2008 EuroPKI http://dx.doi.org/10.1007/978-3-540-69485-4_6 conf/europki/2008 db/conf/europki/europki2008.html#HolzNHC08