Igor A. Bolshakov A Method of Linguistic Steganography Based on Collocationally-Verified Synonymy. 180-191 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3200&spage=180 2004 conf/ih/2004 Information Hiding db/conf/ih/ih2004.html#Bolshakov04