Integral representations of functions and imbedding theorems 
Besov, Oleg V.
Il'in, Valentin P.
Nikol'skiĭ, Sergeĭ M.
Taibleson, Mitchell Herbert.
Washington, D.C. Winston New York London Wiley,
1978
In 2 vols
'A Halsted Press book'
Translation of: 'Integral'nye predstavleniía funkt́siĭ i teoremy vlozheniía'. Moskva : Nauka, 1975
Bibliography: p.331-345
Functions of several real variables.
Invariant embedding.