@misc {IOPORT.70606484,
    author       = {Hsieh, Chao-Kuei and Lai, Shang-Hong and Chen, Yung-Chang},
    title        = {Expressional face image analysis with constrained optical flow},
    howpublished = {ICME, 1553-1556 (2008).},
    year         = {2008},
    doi          = {10.1109/ICME.2008.4607744},
    identifier   = {70606484},
}