Steven Haker Lei Zhu Allen Tannenbaum Sigurd Angenent Optimal Mass Transport for Registration and Warping. 225-240 2004 60 International Journal of Computer Vision 3 http://dx.doi.org/10.1023/B:VISI.0000036836.66311.97 db/journals/ijcv/ijcv60.html#HakerZTA04