Manuel Bodirsky Jaroslav Nesetril Constraint Satisfaction with Countable Homogeneous Templates. 44-57 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2803&spage=44 2003 conf/csl/2003 CSL db/conf/csl/csl2003.html#BodirskyN03