By Ogilvie
By Gamow, George, George Gamow
By Dugan, Sally
By Shaw, Don, Shiels, John
By Bowen-Jones, Michael, Homer, David
By Learning by Questions Team
By Mott, Julian, Rendell, Ian
By Ronald Edward Zupko
By Elizabeth Castro
By Joseph Schmuller
By Neill, Hugh
By W. Michael Kelley
By Colin C. Adams, Joel Hass (Professor of Mathematics, University of California, Davis, USA), Abigail Thompson (Associate Professor of Mathematics
By Peter H. Selby, Steve Slavin
By L. B. Resnick, W. W. Ford
By John Walkenbach
By Giacomo Macola
By B.G. Fletcher, S.A. Lavan
By Seeley, Ivor H., Winfield, Roger
By Forster, George
By Seeley, I.
By Peter Rich, John Streeter
By Peter Newton
By Randall McMullan
By Switzer
By Gabriela Kutting
By Nuffield Foundation
By Barraclough, Jack, Nicholson, Su, Kyffin, Huw, Ward-Penny, Robert, Asker, Nick, Bettison, Ian
By Haines, R., Haines, B.
By Microsoft