Geodesic
On the General Mountain Pass Principle of Ghoussoub-Preiss
Mathematica balkanica, Tome 5 (1991) no. 4, p. 350 
N. K. Ribar ska; Ts. Y. Tsachev; M. I. Krastanov. On the General Mountain Pass Principle of Ghoussoub-Preiss. Mathematica balkanica, Tome 5 (1991) no. 4, p. 350. http://geodesic.mathdoc.fr/item/MABA_1991_5_4_a6/
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     title = {On the {General} {Mountain} {Pass} {Principle} of {Ghoussoub-Preiss}},
     journal = {Mathematica balkanica},
     pages = {350},
     year = {1991},
     volume = {5},
     number = {4},
     url = {http://geodesic.mathdoc.fr/item/MABA_1991_5_4_a6/}
}
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