BOJARSKI, Bogdan; IHNATSYEVA, Lizaveta; JUHA KINNUNEN, JUHA KINNUNEN. How to Recognize Polynomials in Higher Order Sobolev Spaces. Mathematica Scandinavica, Berkeley, CA, United States, v. 112, n. 2, p. 161–181, 2013. DOI: 10.7146/math.scand.a-15239. Disponível em: https://journals.msp.org/mscand/article/view/458. Acesso em: 24 jul. 2026.