TY - BOOK AU - Graef,John R. AU - Kong,Lingju TI - Multiple solutions of boundary value problems: a variational approach SN - 9789814696548 (hbk. : alk. paper) AV - QA379 .G72 2016 PY - 2016/// CY - New Jersey PB - World Scientific KW - Boundary value problems KW - Variational method KW - Differential equations N1 - Includes bibliographical references and index ER -