@article{10_4064_fm_115_1_9_26,
     author = {A. Suszycki},
     title = {Retracts and homotopies for multi-maps},
     journal = {Fundamenta Mathematicae},
     pages = {9--26},
     publisher = {mathdoc},
     volume = {115},
     number = {1},
     year = {1983},
     doi = {10.4064/fm-115-1-9-26},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-115-1-9-26/}
}