6Birch, F.. The Velocity of Compressional Waves in rocks to 10 Kilobars ,Partl. J Geophys . Res. , 1960,Vol. 65,1083-1102.
7Birch, F.. The Velocity of Compressional Waves in rocks to 10 Kilobars,Part2. J Geophys . Res.,1961,Vol. 66,2199-2224.
8Terry. N. B. ,Seaborne, N.F.. The elastic Properties of Coal . Part 5. An apparatus for measuring elsstic pulse Velocity in Coal specimen. N. C. B. , Mining Research Establishment Rept. 1957. 2079.
9Youash,Y. Y. Dyanamic physical properities of rocks.Part II, Experimental results. Proc. 2nd Cong. Int.soc. Rock Mech. ,Belgrade. 1970,Vo1.1,185-195.
10Ramana, Y. V., Venkatanarayana, B.. Laboratory studies on Kolar rocks, Int. J. Rock Mech. ,Min. Sci & Geomench. Abstr, 1973, Vol. 10,465-489.
