MathSciNet bibliographic data MR1457485 46E35 Reshetnyak, Yu. G. Sobolev classes of functions with values in a metric space. (Russian) Sibirsk. Mat. Zh. 38 (1997), no. 3, 657--675, {\rm iii--iv}; translation in Siberian Math. J. 38 (1997), no. 3, 567–583 Article

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