TY - BOOK AU - Essén,Matts R. TI - The cos [pi lambda] theorem T2 - Lecture notes in mathematics SN - 0387071768 PY - 1975/// CY - Berlin, New York PB - Springer-Verlag KW - Potential theory (Mathematics) KW - Subharmonic functions KW - Inequalities (Mathematics) N1 - Includes bibliographies and index ER -