@misc {IOPORT.70009386,
    author       = {Tri, Nguyen Thanh and Le Nguyen, Minh and Shimazu, Akira},
    title        = {Improving the accuracy of question classification with machine learning},
    howpublished = {RIVF, 234-241 (2007).},
    year         = {2007},
    doi          = {10.1109/RIVF.2007.369162},
    identifier   = {70009386},
}