%0 Journal Article %A Chodounský, David %T Non-normality and relative normality of Niemytzki plane %J Acta Universitatis Carolinae. Mathematica et Physica %D 2007 %P 37-41 %V 48 %N 2 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/AUCMP_2007__48_2_a3/ %G en %F AUCMP_2007__48_2_a3