Geodesic
Multi-valued contraction mappings in metric spaces.
Aequationes mathematicae, Tome 16 (1977), pp. 297-302.

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@article{AM2_1977__16_136701,
     author = {Stefan Czerwik},
     title = {Multi-valued contraction mappings in metric spaces.},
     journal = {Aequationes mathematicae},
     pages = {297--302},
     publisher = {mathdoc},
     volume = {16},
     year = {1977},
     zbl = {0385.54027},
     url = {http://geodesic.mathdoc.fr/item/AM2_1977__16_136701/}
}
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Stefan Czerwik. Multi-valued contraction mappings in metric spaces.. Aequationes mathematicae, Tome 16 (1977), pp. 297-302. http://geodesic.mathdoc.fr/item/AM2_1977__16_136701/