1. J.A. Franklin, E. Hoek, Developments in triaxial testing technique, Rock Mech Rock Engg. 2.4 (1970) 223-228.
2. X. Li, L. Shi, B. Bai, Q. Li, D. Xu, X. Feng, True-triaxial testing techniques for rocks–State of the art and future perspectives, in: M. Kwaśniewski et al. (Eds.), True Triaxial Testing of Rocks, CRC Press/Balkema, Leiden, 2012, pp. 3-16.
3. M.S. Paterson, T. Wong, Experimental rock deformation-the brittle field, Sprng Sc. & Business Media, 2005.
4. T. Kármán, Strength under pressure (in German), Z. Ver. dtsch. Ing. 55 (1911) 1749-1757.
5. E. Hoek, J.A. Franklin, Simple triaxial cell for field or laboratory testing of rock, Instn Min. Metall. 77 (1968) A22-26.