목록 The effect of joint conditions on the longitudinal and flexural wave velocities of a rock mass Journal ADVANCED NONDESTRUCTUVE EVALUATION I, PTS 1 AND 2, PROCEEDINGS BOOK SERIES: KEY ENGINEERING MATERIALS Vol 321-323 Page 306-309 Author Cha, MS ; Sim, YJ ; Cho, GC [Cho, Gye-Chun]; Lee, SW Year 2008~