Affiliation: | a Geotechnical Department Vara?din, University of Zagreb, 7 Hallerova Apleja, 42000 Vara?din, Croatia b Ru?er Boškovi? Institute, 54 Bijeni?ka Cesta, P.O. Box 180, 10002 Zagreb, Croatia c Uzhhorod State University, 46 Pidhirna St., Uzhhorod 88000, Ukraine |