Tae-Jun Park Mun-Kyu Lee E-yong Kim Kunsoo Park A General Expansion Method Using Efficient Endomorphisms. 112-126 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2971&spage=112 2003 conf/icisc/2003 ICISC db/conf/icisc/icisc2003.html#ParkLKP03