Geodesic
Conditions for the imbedding of the function class $W_f^1(G,\,A)$ in the space $C(G)$
Matematičeskie zametki, Tome 9 (1971) no. 6, pp. 639-650.

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The function class $W_f^1(G,A)$ is defined. A general problem concerning necessary and sufficient conditions under which this class can be imbedded in the space $C(G)$ of functions continuous on $G$ is posed, and the special case of this problem in which the function $f(x_1,x_2,\dots,x_n)$, involved in the definition of $W_f^1(G,A)$ on $|x|=\sqrt{x_1^2+x_2^2+\dots+x_n^2}$ is solved. 
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     author = {E. A. Rozenfel'd},
     title = {Conditions for the imbedding of the function class $W_f^1(G,\,A)$ in the space $C(G)$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {639--650},
     publisher = {mathdoc},
     volume = {9},
     number = {6},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_9_6_a3/}
}
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E. A. Rozenfel'd. Conditions for the imbedding of the function class $W_f^1(G,\,A)$ in the space $C(G)$. Matematičeskie zametki, Tome 9 (1971) no. 6, pp. 639-650. http://geodesic.mathdoc.fr/item/MZM_1971_9_6_a3/