@article{10_4064_cm_42_1_291_293,
     author = {Jerzy {\L}o\'s},
     title = {Characteristic sets of a system of equivalence relations},
     journal = {Colloquium Mathematicum},
     pages = {291--293},
     publisher = {mathdoc},
     volume = {42},
     number = {1},
     year = {1979},
     doi = {10.4064/cm-42-1-291-293},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-42-1-291-293/}
}