@article{FORUM_1990__2_3_141643,
     author = {K. Ciesielski and K. Ostaszewski},
     title = {Density {Continuity} versus {Continuity.}},
     journal = {Forum mathematicum},
     pages = {265--276},
     publisher = {mathdoc},
     volume = {2},
     number = {3},
     year = {1990},
     zbl = {0714.26002},
     url = {http://geodesic.mathdoc.fr/item/FORUM_1990__2_3_141643/}
}