Lan Nguyen Reihaneh Safavi-Naini Breaking and Mending Resilient Mix-Nets. 66-80 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2760&spage=66 2003 conf/pet/2003 Privacy Enhancing Technologies db/conf/pet/pet2003.html#NguyenS03