G.  Xu, Qiu, L., and Peng, X., ?Hot topic extraction and public opinion classification of tibetan texts?, Journal of Digital Information Management, vol. 14, no. 3, pp. 160 - 167, 2016.

L.  Hu, Zhao, J., Xu, G., Ding, Y., and Chu, J., ?A survey on data migration management in cloud environment?, Journal of Digital Information Management, vol. 10, no. 5, pp. 324 - 331, 2012.