@article{10_4064_cm_31_1_67_69,
     author = {Jerzy Dydak},
     title = {On elementary maps},
     journal = {Colloquium Mathematicum},
     pages = {67--69},
     publisher = {mathdoc},
     volume = {31},
     number = {1},
     year = {1974},
     doi = {10.4064/cm-31-1-67-69},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-31-1-67-69/}
}