1. Assistant Lecturer, Dept. of Construction Materials and Engineering Geology, Budapest Univ. of Technology and Economics. E-mail: rnemes@mailbox.hu
2. Associate Professor, Dept. of Construction Materials and Engineering Geology, Budapest Univ. of Technology and Economics, Muegyetem rkp. 3, Budapest, H-1111 Hungary. E-mail: zsjozsa@epito.bme.hu