MathSciNet bibliographic data MR1227516 (94g:13012) 13F20 (13B02) Daigle, D. Purely inseparable extensions of ${\bf k}[X,Y]$${\bf k}[X,Y]$. Proc. Amer. Math. Soc. 121 (1994), no. 1, 1–12. Article

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