A counterexample to “An extension of Gregus fixed point theorem”.
Moradi, Sirous
Fixed Point Theory and Applications [electronic only], Tome 2011 (2011), / Harvested from The Electronic Library of Mathematics
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Publié le : 2011-01-01
DOI : https://doi.org/10.1155/2011/484717
EUDML-ID : urn:eudml:doc:222882 
@article{05897678,
     title = {A counterexample to ``An extension of Gregus fixed point theorem''.},
     journal = {Fixed Point Theory and Applications [electronic only]},
     volume = {2011},
     year = {2011},
     doi = {10.1155/2011/484717},
     zbl = {1215.47046},
     language = {en},
     url = {http://dml.mathdoc.fr/item/05897678}
}

Moradi, Sirous. A counterexample to “An extension of Gregus fixed point theorem”.. Fixed Point Theory and Applications [electronic only], Tome 2011 (2011) . doi : 10.1155/2011/484717. http://gdmltest.u-ga.fr/item/05897678/