Ghoussoub, Nassif <br/><br/>
Duality and perturbation methods in critical point theory   

 - Cambridge  Cambridge University Press  1991 
 - xviii, 258p. Index. Appendix 
 - Cambridge tracts in Mathematics   v.107 .
<br/><br/>  
<br/><br/><label>Dewey Class. No.: </label>516  / G427.DP