Longo,G, ed. Geometries,Codes and Cryptography / edited by G.Longo,M.Marchi and A.Sgarro - New York Springer- Verlag 1990 - 227 p. - International Centre for Mechanical Sciences Courses and Lectures- no;313 . Subjects--Index Terms: Geometry Cryptography Universal Decimal Class. No.: 514 / LON