RT Journal Article SR Electronic(1) A1 Vainikainen, P. A1 Tiuri, M. A1 Kontra, V A1 Nyfors, E.YR 1992 T1 Portable short range subsurface radar JF , VO OP SP cp-303-00004 DO https://doi.org/10.3997/2214-4609-pdb.303.4 PB European Association of Geoscientists & Engineers, SN 2214-4609, AB , UL https://www.earthdoc.org/content/papers/10.3997/2214-4609-pdb.303.4