@article{tpami_ps,
        AUTHOR = "Wu, T.P. and Tang, K.L. and Tang, C.K. and Wong, T.T.",
        TITLE = "Dense Photometric Stereo: A Markov Random Field Approach",
        JOURNAL = PAMI,
        VOLUME = "28",
        YEAR = "2006",
        NUMBER = "11",
        MONTH = "November",
        PAGES = "1830-1846"}