Vitezslav Svejdar Kamila Bendová On inter-expressibility of logical connectives in Gödel fuzzy logic. 103-105 2000 4 Soft Comput. 2 http://www.springerlink.com/openurl.asp?genre=article&issn=1432-7643&volume=4&issue=2&spage=0103 db/journals/soco/soco4.html#SvejdarB00