A Companion to Roman ArchitectureRoger B. Ulrich, Caroline K. Quenemoen · First published 2013Open the Tome
Die Internet-ÖkonomieAxel Zerdick, Klaus Schrape, Alexander Artope, Klaus Goldhammer, Dominik K. Heger, Ulrich T. Lange, Eckart Vierkant, Esteban Lopez-Escobar, Roger Silverstone · First published 2001 · Latest edition 2012Open the Tome
Solar Electromagnetic Radiation Study for Solar Cycle 22Judit M. Pap, Claus Fröhlich, Roger K. Ulrich · First published 2012Open the Tome
Close binary starsMiroslav Plavec, Roger K. Ulrich, M.J. Plavec, D.M. Popper · First published 1980Open the Tome
