Katz, Nicholas M Exponential sums and differential equations by Nicholas M. Katz - Princeton, N.J Princeton University Press 1990 - 430 p - Annals of mathematics studies no. 124 . Contine bibliogr ISBN: 0691085986 (alk. paper) 0691085994 (alk. paper) LCCN: 90034934 Subjects--Topical Terms: Exponential sumsDifferential equations