[1] Zhijie Xu, Zhiquan Qi, et al, Learning with positive and unlabeled examples using biased twin support vector machine，Neural Computing & Applications，2014, 25（6）：1303~1311.

[2] Guo, X., Xu, Z., Zhang, J., Lu, J. and Zhang, H., An OD Flow Clustering Method Based on Vector Constraints: A Case Study for Beijing Taxi Origin-Destination Data. ISPRS International Journal of Geo-Information, 2020，9(2), p.128.

[3] 王胜开,徐志洁,张健钦,等.逆向热力图的绘制方法.地球信息科学学报, 2018, 20(4):515-522.

[4] Xu Z, Zhang J, Wang H. Twin Minimax Probability Machine for Handwritten Digit Recognition. International Journal of Hybrid Information Technology. 2015;8(2):31-40.

[5] Zhijie Xu，Jianqin Zhang，et al，Locally Linear Embedding by Linear Programming，Procedia Engineering，2011，15：3041~3045

[6] 徐志洁，一种处理多类分类问题的强化支持向量机方法，计算机工程与应用，2009.9.11，（26）：176~178

[7] Xu Z, Zhang J, Xu Z, Chen Z. Handwritten Numeral Recognition Using Support Vector Machine with Bias. In 2011 International Conference in Electrics, Communication and Automatic Control Proceedings 2012 (pp. 1069-1075). Springer, New York, NY.