Dan Zhang Xinge You Patrick Shen-Pei Wang Svetlana N. Yanushkevich Yuan Yan Tang Facial Biometrics Using Nontensor Product Wavelet and 2D Discriminant Techniques. 521-543 2009 23 IJPRAI 3 http://dx.doi.org/10.1142/S0218001409007260 db/journals/ijprai/ijprai23.html#ZhangYWYT09