@article{AUCMP_2003__44_2_a5,
     author = {D\v{z}amonja, Mirna and Plebanek, Grzegorz},
     title = {Generalisations of $\varepsilon$-density},
     journal = {Acta Universitatis Carolinae. Mathematica et Physica},
     pages = {57--64},
     publisher = {mathdoc},
     volume = {44},
     number = {2},
     year = {2003},
     mrnumber = {2101902},
     zbl = {1057.03031},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUCMP_2003__44_2_a5/}
}