STOCKE, B. M. A Lusin Type Approximation of Bessel Potentials and Besov Functions by Smooth Functions. MATHEMATICA SCANDINAVICA, [S. l.], v. 77, p. 60–70, 1995. DOI: 10.7146/math.scand.a-12549. Disponível em: https://www.mscand.dk/article/view/12549. Acesso em: 29 apr. 2024.