Ariadna Quattoni Sy Bor Wang Louis-Philippe Morency Michael Collins Trevor Darrell Hidden Conditional Random Fields. 1848-1852 2007 29 IEEE Trans. Pattern Anal. Mach. Intell. 10 http://doi.ieeecomputersociety.org/10.1109/TPAMI.2007.1124 db/journals/pami/pami29.html#QuattoniWMCD07