A. Grigoryan, and S. Agaian. Applied Mathematics and Sciences: An International Journal (MathSJ), volume 1 of IFIP Advances in Information and Communication Technology, page 23-39. Springer, (December 2014)
S. Khan, and M. Shah. Computer Vision and Pattern Recognition, 2001. CVPR 2001. Proceedings
of the 2001 IEEE Computer Society Conf. on, 2, page II--746 -- II--751 vol.2. (2001)