RT Journal Article SR Electronic(1) A1 Taketomi, K. A1 Wada, K.YR 1998 T1 Wave Characteristics of Radar Echo Contained Air Void in Shallow Underground JF , VO OP SP cp-43-00102 DO https://doi.org/10.3997/2214-4609.201407127 PB European Association of Geoscientists & Engineers, SN 2214-4609, AB , UL https://www.earthdoc.org/content/papers/10.3997/2214-4609.201407127