On the mountain pass lemma
Kung-Ching Chang
Equadiff 6, GDML_Books, (1986), p. [203]-208 / Harvested from
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@article{700170,
     title = {On the mountain pass lemma},
     booktitle = {Equadiff 6},
     series = {GDML\_Books},
     publisher = {J. E. Purkyn\v e University, Department of Mathematics},
     address = {Brno},
     year = {1986},
     pages = {[203]-208},
     mrnumber = {MR0877125},
     zbl = {0604.58015},
     url = {http://dml.mathdoc.fr/item/700170}
}

Kung-Ching Chang. On the mountain pass lemma, dans Equadiff 6, GDML_Books,  (1986), pp. [203]-208. http://gdmltest.u-ga.fr/item/700170/