@article{10_4064_fm_41_2_163_167,
     author = {J. Popru\.zenko},
     title = {Sur une propri\'et\'e des transformations des ensembles abstraits},
     journal = {Fundamenta Mathematicae},
     pages = {163--167},
     publisher = {mathdoc},
     volume = {41},
     number = {2},
     year = {1955},
     doi = {10.4064/fm-41-2-163-167},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-41-2-163-167/}
}