RT Journal Article SR Electronic(1) A1 H. Worthington, M.YR 1990 T1 Velocities from crosshole surveys: Some causes of image distortion JF , VO OP SP cp-53-00038 DO https://doi.org/10.3997/2214-4609.201411885 PB European Association of Geoscientists & Engineers, SN 2214-4609, AB , UL https://www.earthdoc.org/content/papers/10.3997/2214-4609.201411885