Harmuth, Henning F. Transmission of information by orthogonal functions / Henning F. Harmuth. - 2nd ed. - Berlin ; New York : Springer-Verlag, 1972. - xii, 393 p. ill. ; 24 cm. Bibliogr.: p. 367-388 ISBN: 3540055126 (Berlin) 0387055126 (New York) Subjects--Topical Terms: Functions, OrthogonalInformation theory