Mark W. Koch Rangasami L. Kashyap Using Polygons to Recognize and Locate Partially Occluded Objects. 483-494 1987 9 IEEE Trans. Pattern Anal. Mach. Intell. 4 http://dx.doi.org/10.1109/TPAMI.1987.4767936 db/journals/pami/pami9.html#KochK87