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@article{CMUC_1989__30_4_a25, author = {Yun, Ziqiu}, title = {On a problem of {J.} {Nagata}}, journal = {Commentationes Mathematicae Universitatis Carolinae}, pages = {811--815}, publisher = {mathdoc}, volume = {30}, number = {4}, year = {1989}, mrnumber = {1045914}, zbl = {0692.54017}, language = {en}, url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a25/} }
Yun, Ziqiu. On a problem of J. Nagata. Commentationes Mathematicae Universitatis Carolinae, Tome 30 (1989) no. 4, pp. 811-815. http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a25/