@article{10_4064_cm_19_1_27_35,
     author = {B. W\k{e}glorz and A. Wojciechowska},
     title = {Summability of pure extensions of relational structures},
     journal = {Colloquium Mathematicum},
     pages = {27--35},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1968},
     doi = {10.4064/cm-19-1-27-35},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-19-1-27-35/}
}