Zujun Hou Wenlong Qian Su Huang Qingmao Hu Wieslaw Lucjan Nowinski Regularized fuzzy c-means method for brain tissue clustering. 1788-1794 2007 28 Pattern Recognition Letters 13 http://dx.doi.org/10.1016/j.patrec.2007.05.004 db/journals/prl/prl28.html#HouQHHN07