@article{10_4064_cm_18_1_197_201,
     author = {Karol Borsuk},
     title = {Concerning the set of retractions},
     journal = {Colloquium Mathematicum},
     pages = {197--201},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {1967},
     doi = {10.4064/cm-18-1-197-201},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-18-1-197-201/}
}