Takahiko Horiuchi Marc Rioux Ryoji Haruki Kazuhiko Yamamoto Hiromitsu Yamada Kazuo Toraichi Three-dimensional approach to thresholding seal impressions. 719-724 1996 29 Pattern Recognition 5 http://dx.doi.org/10.1016/0031-3203(95)00125-5 db/journals/pr/pr29.html#HoriuchiRHYYT96