International Tables for Crystallography, Volume E, 2nd Edition, Subperiodic Groups

Dr Vojtech Kopsky, Department of Physics, University of the South Pacific, Fiji, and Institute of Physics, The Academy of Sciences of the Czech Republic, Prague, Czech Republic.

Professor Daniel B. Litvin, Department of Physics, The Eberly College of Science, The Pennsylvania State University, USA.

Professor Litvin's research interests include: Mathematical crystallography, phase transitions, ferroic crystals, analysis of x-ray and neutron diffraction of magnetic and non-magnetic crystals, and symmetry of biological macromolecules as determined by x-ray analysis.