1. “The Application of the Mathematical Theory of Linear Elasticity to the Problems of Stress in Hard Rock at Great Depth”;DENKHAUS;Pap. Ass. Min. Mngrs. S. Afr.,1958
2. KUUN, T. C. D. “A Mathematical Analysis of Rock Stress Problems” M.Sc. (Eng.) Thesis, University of Witwatersrand, 1958.
3. “Die Theorie der Elastizität und die Bedürfnisse der Festigkeitslehre”;KIRSCH;Z.V.D.I.,1898
4. Introduction to the Theoretical Analysis of Stress and Strain.;DURELLI,1958
5. DUVALL, W. I. “Stress Analysis Applied to Underground Mining Problems. Parts I and II” U.S. Bureau of Mines, R.I. 4192 and 4387, 1948.