By Siegfried Bosch
By Michele Audin, Mihai Damian, Reinie Erne
By Ian M. Chiswell
By Nicolas Bergeron
By Jurgen Jost
By Marcos Dajczer, Ruy Tojeiro
By Leonor Godinho, Jose Natario
By Graham Everest, Thomas Ward
By Alexandru Dimca
By Mark J.D. Hamilton
By Jean-Claude Hausmann
By Marc Hindry
By Sean Dineen
By Michael Field
By Andrew Baker
By James W. Anderson
By Juliusz Brzezinski
By Jeremy Gray
By S. G. Hoggar (University of Glasgow)
By H. Takayasu
By Stefan Hildebrandt, Anthony Tromba
By Kenneth Falconer (Professor of Pure Mathematics, University of St Andrews)
By Sherman K. Stein, Anthony Barcellos
By Mauro C. Beltrametti, Ettore Carletti, Dionisio Gallarati, Francis Sullivan
By Euclid, Thomas L. Heath, Dana Densmore
By Alfred S. Posamentier, Ingmar Lehmann
By The Math Forum
By Linzi Henry