@article{10_4064_cm_40_2_223_225,
     author = {R. B. Sher},
     title = {Products and sums of absolute proper retracts, {II}},
     journal = {Colloquium Mathematicum},
     pages = {223--225},
     publisher = {mathdoc},
     volume = {40},
     number = {2},
     year = {1978},
     doi = {10.4064/cm-40-2-223-225},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-40-2-223-225/}
}