Ragini Choudhury Cordelia Schmid Krystian Mikolajczyk Face Detection and Tracking in a Video by Propagating Detection Probabilities. 1215-1228 2003 25 IEEE Trans. Pattern Anal. Mach. Intell. 10 http://csdl.computer.org/comp/trans/tp/2003/10/i1215abs.htm db/journals/pami/pami25.html#ChoudhurySM03