Gilbert, Robert P., 1932- Constructive methods for elliptic equations / by Robert P. Gilbert - Berlin : Springer-Verlag, 1974 - vi, 397 p. ; 24 cm. - Lecture notes in mathematics (Springer-Verlag) ; 365 . Bibliography : p. 391-397 ISBN: 038706690X LCCN: 73-21280 Subjects--Topical Terms: Differential equations, Elliptic