Chiara Epifanio Filippo Mignosi Jeffrey Shallit Ilaria Venturini Sturmian Graphs and a Conjecture of Moser. 175-187 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3340&spage=175 2004 conf/dlt/2004 Developments in Language Theory db/conf/dlt/dlt2004.html#EpifanioMSV04