@proceedings {3200,
	title = {Combined geophysical methods for cavity detection in highly inhomogeneous material over karstic basement. A case history},
	journal = {5th Meeting of the Environmental and Engineering Geophysical Society (EEGS European)},
	year = {1999},
	month = { September 6-9},
	pages = {VOP-06},
	address = {Budapest, Hungary},
	author = {Papadopoulos, T. and Alexopoulos, J.}
}
