Y. LeCun, F. Huang, and L. Bottou. Computer Vision and Pattern Recognition, 2004. CVPR 2004. Proceedings
of the 2004 IEEE Computer Society Conference on, 2, page II-97--104 Vol.2. (2004)
J. Revertera, M. Sokhn, E. Mugellini, and O. Khaled. AWIC'7 - The 7th Atlantic Web Intelligence Conference, volume 86 of Advances in Soft Computing series, Fribourg, Switzerland, Springer, (January 2011)