@article{10_4064_cm_33_1_91_102,
     author = {R. B. Sher},
     title = {Products and sums of absolute proper retracts},
     journal = {Colloquium Mathematicum},
     pages = {91--102},
     publisher = {mathdoc},
     volume = {33},
     number = {1},
     year = {1975},
     doi = {10.4064/cm-33-1-91-102},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-33-1-91-102/}
}