@article{MASLO_2001_51_3_a1,
     author = {Thron, Reinhard and Koppitz, J\"org},
     title = {Closure operators and generating sets},
     journal = {Mathematica slovaca},
     pages = {259--268},
     year = {2001},
     volume = {51},
     number = {3},
     mrnumber = {1842313},
     zbl = {0987.06004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MASLO_2001_51_3_a1/}
}