@article{RCM_1985__19_181754,
     author = {Jan Mycielski},
     title = {What {Is} {A} {Mathematical} {Theory?}},
     journal = {Revista colombiana de matematicas},
     pages = {173--176},
     publisher = {mathdoc},
     volume = {19},
     year = {1985},
     zbl = {0616.03017},
     url = {http://geodesic.mathdoc.fr/item/RCM_1985__19_181754/}
}