@article{CM_1967__18_1-2_79_0,
     author = {Aull, C. E.},
     title = {Ideals and filters},
     journal = {Compositio Mathematica},
     pages = {79--86},
     publisher = {P. Noordhoff N. V., Groningen},
     volume = {18},
     number = {1-2},
     year = {1967},
     mrnumber = {223469},
     zbl = {0189.02103},
     language = {en},
     url = {http://www.numdam.org/item/CM_1967__18_1-2_79_0/}
}