@article{10_4064_fm_57_3_253_272,
     author = {E. Lopez-Escobar},
     title = {An interpolation theorem for denumerably long formulas},
     journal = {Fundamenta Mathematicae},
     pages = {253--272},
     publisher = {mathdoc},
     volume = {57},
     number = {3},
     year = {1965},
     doi = {10.4064/fm-57-3-253-272},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-57-3-253-272/}
}