Dual variational methods in critical point theory and applications. Ambrosetti, A. & Rabinowitz, P. H. J. Funct. Anal., 14:349--381, 1973.
bibtex   
@article{Ambrosetti1973,
	Author = {Ambrosetti, A. and Rabinowitz, P. H.},
	Journal = {J. Funct. Anal.},
	Mrclass = {46G05 (35J20 58E99)},
	Mrnumber = {0370183 (51 \#6412)},
	Mrreviewer = {D. E. Edmunds},
	Pages = {349--381},
	Title = {Dual variational methods in critical point theory and applications},
	Volume = {14},
	Year = {1973}}

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