1. Ma Xiaohong andYu Xinwei: submitted to Journal of Heilongjiang Institute of Science & Technology(2008). In Chinese.
2. Li Xiaohuo, Yu Xinwei and Ma Xiaohong: submitted to Mining & Processing Equipment (2005).
3. Yao Baoheng, Li Guixuan and Ding Fei. submitted to Coal Science and Technology(2002). In Chinese.
4. Ma Jianmin. submitted to Zhongzhou coal ( 1998).
5. Zhao Jianjun. submitted to Coal Mine Machinery(1998).