TY - CPAPER AU - Todor Delipetrev TI - GEOPHYSICAL METHODS - POSSIBILITIES FOR DEFINING COMPACTNESS AND PHYSICAL - MECHANICAL CHARACTERISTICS OF ROCKS T2 - SGEM International Multidisciplinary Scientific GeoConference EXPO Proceedings; SGEM2011 11th International Multidisciplinary Scientific GeoConference PY - 2011 DO - 10.5593/sgem2011/s06.111 PB - Stef92 Technology ER -