1. 1) Walsh, J. B.: The effect of cracks on the uniaxial compression of rocks, J. Geophys. Res., Vol. 70, pp. 399-411, 1965.
2. 2) Walsh, J. B.: The effect of cracks in rocks on Poisson's ratio, J. Geophys. Res., Vol. 70, pp. 5249-5257, 1965.
3. 3) Brace, W. F.: Brittle fracture of rocks, In: W. R. Judd (ed.), State of stress in the earth's crust, Elsevier, pp. 111-174, 1964.
4. 4) Brace, W. F.: Paulding, B. W., Jr. and Scholz, C. H.: Dilatancy in the fracture of crystalline rocks, J. Geophys. Res., Vol. 71, pp. 3939-3953, 1966.
5. 5) Mogi, K.: Study of elastic shocks caused by the fracture of heterogeneous materials and its relations to earthquake phenomena, Bull. Earthq. Res. Inst., Tokyo Univ., Vol. 40, pp. 125-173, 1962.