Solving Two-Variable Word Equations (Extended Abstract).

Robert Dabrowski Wojciech Plandowski Solving Two-Variable Word Equations (Extended Abstract). 408-419 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3142&spage=408 2004 conf/icalp/2004 ICALP db/conf/icalp/icalp2004.html#DabrowskiP04