1. Abernethy, J., Bach, F., Evgeniou, T., Vert, J.P.: A new approach to collaborative filtering: Operator estimation with spectral regularization. Journal of Machine Learning 10, 803–826 (2009)
2. Argyriou, A., Micchelli, C.A., Pontil, M.: When is there a representer theorem? vector versus matrix regularizers. Journal of Machine Learning Research 10, 2507–2529 (2009)
3. Azoury, K., Warmuth, M.K.: Relative loss bounds for on-line density estimation with the exponential family of distributions. Journal of Machine Learning 43(3), 211–246 (2001)
4. Boser, B.E., Guyon, I.M., Vapnik, V.N.: A training algorithm for optimal margin classifiers. In: Proc. 5th Annual ACM Workshop on Comput. Learning Theory, pp. 144–152. ACM Press, New York (1992)
5. Cavallanti, G., Cesa-Bianchi, N., Gentile, C.: Linear algorithms for online multitask classification. In: Proceedings of the 21st Annual Conference on Learning Theory (COLT 2008), pp. 251–262 (July 2008)