1. Julong, D.: Grey prediction and decision-making. Huazhong University of Science & Technology Publishing House, Wuhan (1998)
2. Guanjun, T.: Construction method and application of background value of GM(1,1) model (I). Theory and practice of system engineering 20(5), 125–127 (2000)
3. Gang, J., Lusheng, L., Zhude, L., et al.: Prediction of grey model for slope displacement. Rock and Soil Mechanics 21(3), 243–246 (2000)
4. Wenxou, L.: Study prediction for rockmass instability due to underground excavation under complex topography. Chinese Journal of Rock Mechanics and Engineering 20, 1645–1648 (2001)
5. Sifeng, L., Tianbang, G., Yaoguo, D.: Theory and application of grey system, 2nd edn. Sciences Press, Beijing (1999)