MELIN, A. A Remark on Invariant Pseudo-Differential Operators. MATHEMATICA SCANDINAVICA, [S. l.], v. 30, p. 290–296, 1972. DOI: 10.7146/math.scand.a-11085. Disponível em: https://www.mscand.dk/article/view/11085. Acesso em: 8 may. 2024.