@misc {IOPORT.70834924,
    author       = {Ortiz, Alberto and Oliver, Gabriel},
    title        = {Estimation of directional and ambient illumination parameters by means of a calibration object},
    howpublished = {ICIAR (1), 672-679 (2004).},
    year         = {2004},
    doi          = {10.1007/978-3-540-30125-7_83},
    identifier   = {70834924},
}