%0 Journal Article %A Abraham, O. %A Cötel, Ph. %A Leonard, Ch. %A Piwakowski, B. %A Shahrour, I. %T Application of the "impact echo method" to the detection of underground cavities part II: field experiments %D 1998 %J , %V %@ 2214-4609 %C cp-43-00092 %R https://doi.org/10.3997/2214-4609.201407117 %I European Association of Geoscientists & Engineers, %X %U https://www.earthdoc.org/content/papers/10.3997/2214-4609.201407117