@article{10_4064_ap_45_3_275_282,
     author = {L. Rybi\'nski},
     title = {Multivalued contraction with parameter},
     journal = {Annales Polonici Mathematici},
     pages = {275--282},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1985},
     doi = {10.4064/ap-45-3-275-282},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-45-3-275-282/}
}