Berg, Christian Harmonic analysis on semigroups: theory of positive definite and related functio / Berg, Christian. - New York: Springer-Verlag, 1984. - x, 289p.; 24cm. - Graduate texts in mathematics ; 100, edited by F. W. Gehring . Includes bibliographical references. ISBN: 9780387909257 Dewey Class. No.: 515.2433 BER