Janusz Kacprzyk Slawomir Zadrozny Protoforms of Linguistic Database Summaries as a Human Consistent Tool for Using Natural Language in Data Mining. 100-111 2009 1 IJSSCI 1 http://www.igi-pub.com/articles/details.asp?ID=33061 db/journals/ijssci/ijssci1.html#KacprzykZ09