00569nam a2200181Ia 4500082001700000100002200017245006400039260004800103300003300151490004400184500000500228690000600233700000500239952009900244964001700343921001000360999001700370  a516bG427.DP  aGhoussoub, Nassif  aDuality and perturbation methods in critical point theoryb  aCambridgebCambridge University Pressc1991  axviii, 258p. Index. Appendix  aCambridge tracts in Mathematicsv v.107  a  a   a  00104070aISIbISId1998-09-21l0o516 G427.DPpDP22254r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a12404  c12404d12404