STOCKE, B. M. A Lusin Type Approximation of Bessel Potentials and Besov Functions by Smooth Functions. Mathematica Scandinavica, Berkeley, CA, United States, v. 77, p. 60–70, 1995. DOI: 10.7146/math.scand.a-12549. Disponível em: https://journals.msp.org/mscand/article/view/1124. Acesso em: 25 jul. 2026.