Adalberto Farias Alexandre Mota Augusto Sampaio Efficient CSP<sub>Z</sub> Data Abstraction. 108-127 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2999&spage=108 2004 conf/ifm/2004 IFM db/conf/ifm/ifm2004.html#FariasMS04