Equivalent extensions to Caristi-Kirk's fixed point theorem, Ekeland's variational principle, and Takahashi's minimization theorem.
Wu, Zili
Fixed Point Theory and Applications [electronic only], Tome 2010 (2010), / Harvested from The Electronic Library of Mathematics
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Publié le : 2010-01-01
DOI : https://doi.org/10.1155/2010/970579
EUDML-ID : urn:eudml:doc:227053 
@article{05692369,
     title = {Equivalent extensions to Caristi-Kirk's fixed point theorem, Ekeland's variational principle, and Takahashi's minimization theorem.},
     journal = {Fixed Point Theory and Applications [electronic only]},
     volume = {2010},
     year = {2010},
     doi = {10.1155/2010/970579},
     zbl = {1202.54046},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05692369}
}

Wu, Zili. Equivalent extensions to Caristi-Kirk's fixed point theorem, Ekeland's variational principle, and Takahashi's minimization theorem.. Fixed Point Theory and Applications [electronic only], Tome 2010 (2010) . doi : 10.1155/2010/970579. http://gdmltest.u-ga.fr/item/05692369/