[1]
Bojarski, B., Ihnatsyeva, L. and JUHA KINNUNEN, J.K. 2013. How to Recognize Polynomials in Higher Order Sobolev Spaces. MATHEMATICA SCANDINAVICA. 112, 2 (Jun. 2013), 161–181. DOI:https://doi.org/10.7146/math.scand.a-15239.