Premkumar T. Devanbu Michael Gertz April Kwong Charles U. Martel Glen Nuckolls Stuart G. Stubblebine Flexible authentication of XML documents. 136-145 2001 ACM Conference on Computer and Communications Security http://doi.acm.org/10.1145/501983.502003 db/conf/ccs/ccs2001.html#DevanbuGKMNS01