MathSciNet bibliographic data MR1177754 46E35 Edmunds, David E.; Rákosník, Jiří Density of smooth functions in \$W\sp {k,p(x)}(\Omega)\$$W\sp {k,p(x)}(\Omega)$. Proc. Roy. Soc. London Ser. A 437 (1992), no. 1899, 229–236. Article

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