By Brani Vidakovic (Georgia Institute of Technology)
By Eastaway, Rob, Rob Eastaway, Jeremy Wyndham
By John Holland
By Mark M. Meerschaert
By Thomas B. A. Senior
By Gilbert Strang (Massachusetts Institute of Technology)
By Stephen J. Turnovsky
By School Mathematics Project
By Tom Chivers
By Peter Turchin
By W. J. Krzanowski
By Dominic W. Massaro (University of California)
By C.W. Kilmister