@article{ZhangPAMI2006,
 title = {Face Recognition from a Single Training Image under Arbitrary Unknown Lighting Using Spherical Harmonics},
 journal = {IEEE Trans. Pattern Anal. Mach. Intell.},
 volume = {28},
 number = {3},
 year = {2006},
 issn = {0162-8828},
 pages = {351--363},
 doi = {http://dx.doi.org/10.1109/TPAMI.2006.53},
 publisher = {IEEE Computer Society},
 address = {Washington, DC, USA},
 }