TY JOUR TI Anisotropy of the rock drill core elastic properties at uniaxial loading KW anisotropy KW core elastic properties KW transducers KW lithologic composition KW porosity nature KW ultrasonic transducers. JO Russian Journal of Earth Sciences AU Patonin, A.V. PY 2003 IS 5 PB Geophysical Center of the Russian Academy of Sciences