Clements David L Boundary value problems governed by second order elliptic systems - Boston Pitman Publisher 1981 - viii,162p. cm. - Monographs and studies in mathematics; 12 . Bibliography 158-160p. Standard No.: 22990 Source: Textual Subjects--Topical Terms: Differential equationsBoundary value problems Dewey Class. No.: B334,1,2, M1