B. Scholkopf, Kah-Kay Sung, C.J.C. Burges, F. Girosi, P. Niyogi, T. Poggio, V. Vapnik,
Comparing support vector machines with Gaussian kernels to radial basis function classifiers IEEE Transactions on Signal Processing. ,vol. 45, pp. 2758- 2765 ,(1997) ,
10.1109/78.650102