1. VŠB, Technical University Ostrava, L. Podéště 1875, 708 33, Ostrava-Poruba, Czech Republic.
2. Department of Civil and Environmental Engineering, University of Utah, Suite 104, 122 South Central Campus Drive, Salt Lake City, UT 84112-0561.
3. Pennsylvania State University, 3127 Research Drive, State College, PA 16801.