By University of Cambridge Local Examinations Syndicate
By brian-moses, Moses, Brian
By School Mathematics Project
By van Andel, Tjeerd H.
By Straker, Anita
By George Gamow, Roger Penrose
By Barlow, Adrian
By Hollis, Martin
By Green, Veronica
By Batchelor, R. E.; Offord, Malcolm H.
By Hashemi, Louise, Murphy, Raymond
By Heritage, J.
By Guiguin, Marc
By Ur, Penny
By Gourvish, T. R.; Wilson, R. G.
By Gunton, Colin E.
By Gillham, Bill
By Gillham, W. E. C., Glasberg, Jean, Snow, Alan
By Bill Graham, Gillham, Bill
By Olver, Peter J.
By Parrott, Martin, Martin Parrott
By Hooper, Meredith