1. Doctoral Thesis;Bylund, Per,1994
2. [Dyn] E. M. Dynkin, Free interpolation by functions with derivatives in 𝐻¹, J. Soviet Math. 27 (1984), 2475-2481.
3. [Gud] Jaume Gudayol, Boundary behaviour of functions in Hardy-Sobolev spaces, doctoral dissertation, Universitat de Barcelona, 1997.
4. Besov spaces on closed subsets of 𝑅ⁿ;Jonsson, Alf;Trans. Amer. Math. Soc.,1994
5. [J-W] Alf Jonsson and Hans Wallin, Function spaces on subsets of ℝⁿ, Math. Reports Volume 2, Part 1, Harwood Academics Publ. GmbH, 1984.