Reshma Khemchandani Aman Pal Tree based multi-category Laplacian TWSVM for content based image retrieval. 1197-1210 2017 8 Int. J. Mach. Learn. Cybern. 4 https://doi.org/10.1007/s13042-016-0493-3 db/journals/mlc/mlc8.html#KhemchandaniP17