1. Sobolev Spaces;Adams,1975
2. Integral Representations of Functions and Embedding Theorems;Besov,1975
3. Spaces of differentiable functions;Besov,2003
4. Spaces that are definable by means of local approximations;Brudnyi;Trudy Moscov. Math. Obshch.,1971
5. Adaptive approximation of functions with singularities;Brudnyi;Trudy Moscov. Mat. Obshch.,1994