Stagg K., Zienkiewicz O., . (1979). Rock mechanics in ingineering practice. London: J.Wiley.
Stagg K.G, Zienkiewicz O.C, . 1979. Rock mechanics in ingineering practice. London: J.Wiley.
Stagg K.G, Zienkiewicz O.C, . Rock mechanics in ingineering practice. London: J.Wiley. 1979.