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MR1093709 58E05 (34C25 58F22 70H05)
Coti Zelati, Vittorio; Ekeland, Ivar; Lions, Pierre-Louis Index estimates and critical points of functionals not satisfying Palais-Smale. Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4) 17 (1990), no. 4, 569–581.
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