@article{gu2015incremental,
  title={Incremental support vector learning for ordinal regression},
  author={Gu, Bin and Sheng, Victor S and Tay, Keng Yeow and Romano, Walter and Li, Shuo},
  journal={IEEE Transactions on Neural networks and learning systems},
  volume={26},
  number={7},
  pages={1403--1416},
  year={2015},
  publisher={IEEE}
}