@article{9:1,author={Gal Chechik and Geremy Heitz and Gal Elidan and Pieter Abbeel and Daphne Koller}, Title={Max-margin Classification of Data with Absent Features},journal={Journal of Machine Learning Research},volume={9}, url={http://www.jmlr.org/papers/volume9/chechik08a/chechik08a.pdf}}