@article{10_4064_cm_3_1_58_62,
     author = {J. {\L}o\'s},
     title = {On the categoricity in power of elementary deductive systems and some related problems},
     journal = {Colloquium Mathematicum},
     pages = {58--62},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1954},
     doi = {10.4064/cm-3-1-58-62},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-3-1-58-62/}
}