1. ABDEL-HAKIM A. FARAG A. CSIFT: a SIFT descriptor with color invariant characteristics 1978 1983 2006
2. What is an object?
3. BEAUDET P.R. Rotationally invariant image operators Proceedings of the International Conference on Pattern Recognition 579 583 1978
4. BOSCH A. ZISSERMAN A. MUNOZ X. Scene classification via pLSA 517 530 2006