Viet Phan Luong T. T. Pham Robert Jeansoulin Integrating Information under Lattice Structure. 83-87 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2871&spage=83 2003 conf/ismis/2003 ISMIS db/conf/ismis/ismis2003.html#Phan-LuongPJ03