%0 Journal Article %A Rutkowski, Aleksander %T Which countable ordered sets have a dense linear extension? %J Mathematica slovaca %D 1996 %P 445-455 %V 46 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/MASLO_1996__46_5_a1/ %G en %F MASLO_1996__46_5_a1