@article{10_4064_fm_94_2_129_143,
     author = {Andreas Blass},
     title = {Two closed categories of filters},
     journal = {Fundamenta Mathematicae},
     pages = {129--143},
     publisher = {mathdoc},
     volume = {94},
     number = {2},
     year = {1977},
     doi = {10.4064/fm-94-2-129-143},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-94-2-129-143/}
}