@article{AMLG_1981__21_137974,
     author = {J.A. Makowsky and M. Ziegler},
     title = {Topological model theory with an interior operator: consistency properties and back - and forth arguments.},
     journal = {Archiv f\"ur mathematische Logik und Grundlagenforschung},
     pages = {37--54},
     publisher = {mathdoc},
     volume = {21},
     year = {1981},
     zbl = {0472.03027},
     url = {http://geodesic.mathdoc.fr/item/AMLG_1981__21_137974/}
}