Non-normality and relative normality of Niemytzki plane
Acta Universitatis Carolinae. Mathematica et Physica, Tome 48 (2007) no. 2, pp. 37-41.

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Classification : 54B05, 54D15, 54G20 
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     title = {Non-normality and relative normality of {Niemytzki} plane},
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Chodounský, David. Non-normality and relative normality of Niemytzki plane. Acta Universitatis Carolinae. Mathematica et Physica, Tome 48 (2007) no. 2, pp. 37-41. https://geodesic-test.mathdoc.fr/item/AUCMP_2007__48_2_a3/