I. M. Yaglom, V. G. Boltyanskii, Paul J. Kelley, Lewis F. Walton (transls) books & textbook

Convex figures (Library of the mathematical circle)

I. M. Yaglom, V. G. Boltyanskii, Paul J. Kelley, Lewis F. Walton (transls)

Holt, Rinehart and Winston /1961T Hardcover / 301 Pages