By Werner Heisenberg
By Wolfgang Rindler
By Jean-Louis Basdevant
By Patricia M. Schwarz, John H. Schwarz (California Institute of Technology)
By Peter Szekeres (University of Adelaide)
By Malcolm S. Longair (University of Cambridge)
By Charles F. Stevens (Salk Institute for Biological Studies)
By Gary Bowman (Department of Physics and Astronomy, Northern Arizona University)
By N.M.J. Woodhouse
By Paul C. Matthews
By Edward George Steward (Emeritus Professor, City Univ, London, UK)
By John P. Cullerne (Head of Physics, Winchester College), Anton Machacek (Head of Physics, Royal Grammar School, High Wycombe)
By Daniel Fleisch (Wittenberg University, Ohio)
By Mikio Nakahara (Kinki University, Osaka, Japan)
By James J. Callahan, Jr.
By Sean Carroll (University of Chicago)
By Richard H. Enns, George McGuire
By Ananyo Bhattacharya
By Brian R. Martin (University College, London), Graham Shaw (University of Manchester)
By Edward Frenkel
By School Mathematics Project
By Jose Maria Montesinos-Amilibia
By Achim Klenke
By Friedrich Sauvigny
By Filip Rindler
By Bryan Rynne, M.A. Youngson
By Michael S. Ruderman
By John Haigh