Stavros Konstantinidis Nicolae Santean Sheng Yu Fuzzification of Rational and Recognizable Sets. 413-447 2007 76 Fundam. Inform. 4 http://iospress.metapress.com/openurl.asp?genre=article&issn=0169-2968&volume=76&issue=4&spage=413 db/journals/fuin/fuin76.html#KonstantinidisSY07