@article{AUCMP_2005__46_2_a9,
     author = {Mildenberger, Heike},
     title = {On the groupwise density number for filters},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {55--63},
     publisher = {mathdoc},
     volume = {46},
     number = {2},
     year = {2005},
     mrnumber = {2194046},
     language = {en},
     url = {https://geodesic-test.mathdoc.fr/item/AUCMP_2005__46_2_a9/}
}