Bulent Tutmez Uzay Kaymak Measure of Uncertainty in Regional Grade Variability. 511-518 2007 Analysis and Design of Intelligent Systems using Soft Computing Techniques http://dx.doi.org/10.1007/978-3-540-72432-2_52 series/asc/2007-41 db/series/asc/asc41.html#TutmezK07