@article{10_4064_fm_82_2_95_103,
     author = {K. Barwise},
     title = {Mostowski's collapsing function and the closed unbounded filter},
     journal = {Fundamenta Mathematicae},
     pages = {95--103},
     publisher = {mathdoc},
     volume = {82},
     number = {2},
     year = {1974},
     doi = {10.4064/fm-82-2-95-103},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-82-2-95-103/}
}