Liping Shen Xiangqun Song Manabu Iguchi Fujio Yamamoto A method for recognizing particles in overlapped particle images. 21-30 2000 21 Pattern Recognition Letters 1 http://dx.doi.org/10.1016/S0167-8655(99)00130-0 db/journals/prl/prl21.html#ShenSIY00