@article{5:2,author={Gert R.G. Lanckriet and Nello Cristianini and Peter Bartlett and Laurent El
  Ghaoui and Michael I. Jordan}, Title={Learning the Kernel Matrix with Semidefinite Programming},journal={Journal of Machine Learning Research},volume={5}, url={http://www.jmlr.org/papers/volume5/lanckriet04a/lanckriet04a.pdf}}