Widder, D. V. An introduction to transform theory / by D.V. Widder. - New York : Academic Press, 1971 - xiv, 253 p. : ill. ; 24 cm. - Pure and applied mathematics ; vol.42 . - Pure and applied mathematics ; vol.42 . bibl p243-246 ISBN: 0127485503 Subjects--Topical Terms: Integral transforms.