Higher math for beginners (mostly physics and engineers) di Zeldovich, Ya B.

A simple non-euclidean geometry and its physical basis. di Yaglom, I. M.

Complex numbers in geometry. di Iaglom (Yaglom), I. M.

Geometric transformations di Yaglom, I. M. (Isaak Moiseevich) 1921-

Geometric transformations di Iaglom (Yaglom), I. M.

Convex figures di Iaglom (Yaglom), I.M. & V.G. Boltyanskii