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2. E. Hoek, Rock Mass Properties, In Practical Rock Engineering, The University of Toronto Press, Canada, 2006, pp. 1-47.
3. Equivalent tunnelling Mohr–Coulomb strength parameters for given Hoek–Brown ones;Sofianos;International Journal of Rock Mechanics and Mining Sciences,2002
4. Tunnelling Mohr–Coulomb strength parameters for rock masses satisfying the generalized Hoek–Brown failure criterion;Sofianos;International Journal of Rock Mechanics and Mining Sciences,2003
5. Equivalent Mohr–Coulomb and generalized Hoek–Brown strength parameters for supported axisymmetric tunnels in plastic or brittle rock;Sofianos;International Journal of Rock Mechanics and Mining Sciences,2006