%0 Journal Article %A Motoyuki, Sato %A Satoshi, Ebihara %A Hiroaki, Niitusma %T Analysis of a directional borehole radar signal with a time-frequency distribution %D 1994 %J , %V %@ 2214-4609 %C cp-300-00041 %R https://doi.org/10.3997/2214-4609-pdb.300.43 %I European Association of Geoscientists & Engineers, %X %U https://www.earthdoc.org/content/papers/10.3997/2214-4609-pdb.300.43