MathSciNet bibliographic data MR123130 41.30 Smoljak, S. A. $\varepsilon$$\varepsilon$-entropy of the classes $E\sb{s\sp{\alpha ,k}}(B)$$E\sb{s\sp{\alpha ,k}}(B)$ and $W\sb{s\sp{\alpha }}\,(B)$$W\sb{s\sp{\alpha }}\,(B)$ in the metric of $L\sb{2}$$L\sb{2}$. Dokl. Akad. Nauk SSSR 131 30--33 (Russian); translated as Soviet Math. Dokl. 1 1960 192–196. Links to the journal or article are not yet available

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