@article{10_4064_cm_50_1_13_18,
     author = {W. Bartol and D. Niwi\'nski and L. Rudak},
     title = {Completion varieties},
     journal = {Colloquium Mathematicum},
     pages = {13--18},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {1985},
     doi = {10.4064/cm-50-1-13-18},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-50-1-13-18/}
}