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@article{PIM_1977_N_S_22_36_a18, author = {Peter Krenger and J\"urg R\"atz}, title = {On {The} {Sup} {And} {Inf} {Invariance} {Of} {Some} {Separation} {Axioms}}, journal = {Publications de l'Institut Math\'ematique}, pages = {145 }, publisher = {mathdoc}, volume = {_N_S_22}, number = {36}, year = {1977}, url = {http://geodesic.mathdoc.fr/item/PIM_1977_N_S_22_36_a18/} }
Peter Krenger; Jürg Rätz. On The Sup And Inf Invariance Of Some Separation Axioms. Publications de l'Institut Mathématique, _N_S_22 (1977) no. 36, p. 145 . http://geodesic.mathdoc.fr/item/PIM_1977_N_S_22_36_a18/