1. Aggson, J.R., 1979. Stress-Induced Failures in Mine Roof. United States Department of the Interior, U.S. Bureau of Mines, Report of Investigations 8338.
2. Chen, H.J., Peng, S.S., 1998. Mechanism of Roof Failure in Longwall Entry System Under High Horizontal Stress Conditions. Society for Mining, Metallurgy, and Exploration, presented at the SME-AIME Annual Meeting, Orlando, FL, March 9–11, 1998, Preprint No. 98–163.
3. Mark, C., 1991. Horizontal Stress and its Effects on Longwall Ground Control. Mining Engineering, November 1991, pp. 1356–1360.
4. Mark, C., Mucho, T., 1994. Longwall Mine Design for Control of Horizontal Stress. USBM Special Publication 01–94, New Technology for Longwall Ground Control, pp. 53–76.
5. Molinda, G.M., Mark, C., 1994. The Coal Mine Roof Rating (CMRR): A Practical Rock Mass Classification for Coal Mines, 12th Conference on Ground Control in Mining, IC9387.