@article{10_4064_cm_10_1_25_29,
     author = {Jerzy P{\l}onka},
     title = {On bases with respect to a closure operator with the exchange property},
     journal = {Colloquium Mathematicum},
     pages = {25--29},
     publisher = {mathdoc},
     volume = {10},
     number = {1},
     year = {1963},
     doi = {10.4064/cm-10-1-25-29},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-10-1-25-29/}
}