1. R. A. Adams, Sobolev Spaces, Academic Press, New York (1975).
2. H. Beirao da Veiga, Boundary-value problems for a class of first order partial differential equations in Sobolev spaces and applications to the Euler flow, Sem. Mat. Univ. Padova, 79, 247–276 (1988).
3. S. Bochner, Integration von Funktionen, deren Wert die Elemente eines Vektorraumes sind, Fund. Math., 20, 262–276 (1933).
4. E. B. Bykhovskii, Solution of the mixed problem for Maxwell’s equations in the case of ideal conducting boundary Vestnik Lenigrad. Univ., 12(13), 50–66 (1957).
5. E. H. Bykhovskii and N. V. Smirnov, On orthogonal decomposition of the space of vector-functions in a given domain and operators of vector analysis, Trudy Mat. Inst. Steklov., 59, 5–36 (1960).