Le Lu, Jianhua Yao, Evrim Turkbey, Ronald M. Summers. Multilevel image recognition using discriminative patches and kernel covariance descriptor. In Stephen R. Aylward, Lubomir M. Hadjiiski, editors, Medical Imaging 2014: Computer-Aided Diagnosis, San Diego, California, United States, 15-20 February 2014. Volume 9035 of SPIE Proceedings, pages 903528, SPIE, 2014. [doi]