Einstein, H.H. (1978). Subsurface geology – Petroleum, mining construction. Engineering Geology, 12, 393. doi:10.1016/0013-7952(78)90020-0
Einstein, H.H. (1978). Subsurface geology – Petroleum, mining construction. Engineering Geology, 12, 393. doi:10.1016/0013-7952(78)90020-0