Candelaria Hernández-Goya Pino Caballero-Gil Carlos Bruno-Castaneda A Secret Sharing Scheme Using Matrices. 84-90 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2669&spage=84 2003 conf/iccsa/2003-3 ICCSA (3) db/conf/iccsa/iccsa2003-3.html#Hernandez-GoyaCB03