Note on a theorem of J. Nagata
Compositio Mathematica, Tome 21 (1969) no. 1, pp. 4-6. 
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     title = {Note on a theorem of {J.} {Nagata}},
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     number = {1},
     year = {1969},
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     zbl = {0184.48003},
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     url = {http://archive.numdam.org/item/CM_1969__21_1_4_0/}
}
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Vaughan, J. E.; Wenner, B. R. Note on a theorem of J. Nagata. Compositio Mathematica, Tome 21 (1969) no. 1, pp. 4-6. http://archive.numdam.org/item/CM_1969__21_1_4_0/

K. Nagami [1] Some theorems in dimension theory for non-separable spaces, Journal of the Math. Soc. of Japan 9 (1957), pp. 80-92. | MR | Zbl

J. Nagata [2] Two theorems for the n-dimensionality of metric spaces, Comp. Math. 15 (1963), pp. 227-237. | Numdam | MR | Zbl