Véronique Ventos Henry Soldano Alpha Galois Lattices: An Overview. 299-314 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3403&spage=299 2005 conf/icfca/2005 ICFCA db/conf/icfca/icfca2005.html#VentosS05