ATRACTOR

[1] Bonnesen, Fenchel, Theory of convex bodies, BCS Associates (1987).

[2] Hall, Wagon, Roads and Wheels, Mathematics Magazine, vol. 65, nº 5, 283-301 (1992).

[3] Honsberger, Ingenuity in Mathematics, MAA(1970).

[4] Niven, Maxima and minima without calculus, MAA, Dolciani Mathematical Expositions 6 (1981).

[5] Rademacher, Toeplitz, The enjoyment of Mathematics, Princeton University Press (1970)