Continuity points in {x}×Y
Bulletin de la Société Mathématique de France, Tome 108 (1980), pp. 113-115. 
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     author = {Piotrowski, Zbigniew},
     title = {Continuity points in $\lbrace x\rbrace \times Y$},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {113--115},
     publisher = {Soci\'et\'e math\'ematique de France},
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     year = {1980},
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Piotrowski, Zbigniew. Continuity points in $\lbrace x\rbrace \times Y$. Bulletin de la Société Mathématique de France, Tome 108 (1980), pp. 113-115. doi : 10.24033/bsmf.1911. https://www.numdam.org/articles/10.24033/bsmf.1911/

[1] Namioka (I.). - Separate continuity and joint continuity, Pacific J. Math., vol. 51, 1974, p. 515-531. | MR | Zbl

[2] Piotrowski (Z.). - Quasi-continuity and product spaces, Proc. Conf. Geom. Topology, Warsaw, 1978. | Zbl

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