@article{AMLG_1975__17_137896,
     author = {George S. Boolos},
     title = {On {Kalmar's} consistency proof and a generalization of the notion of ...-consistency.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {3--8},
     publisher = {mathdoc},
     volume = {17},
     year = {1975},
     zbl = {0324.02021},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1975__17_137896/}
}