Oscar Díaz Salvador Trujillo Iker Azpeitia User-Facing Web Service Development: A Case for a Product-Line Approach. 66-77 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2819&spage=66 2003 conf/tes/2003 TES db/conf/tes/tes2003.html#DiazTA03