![Elementary Problems: E1681-E1690]()
Elementary Problems: E1681-E1690Azriel Rosenfeld, V. R. Rao Uppuluri, Eugene Ehrhart, E. A. Lee, F. D. Parker, Richard Sinkhorn, Daniel Pedoe, R. A. Jacobson, Erwin Just, Norman Schaumberger and D. E. Daykin · The American Mathematical Monthly · 1964