WAGNER, P. A Fundamental Solution of N. Zeilon’s Operator. MATHEMATICA SCANDINAVICA, [S. l.], v. 86, n. 2, p. 273–287, 2000. DOI: 10.7146/math.scand.a-14293. Disponível em: https://www.mscand.dk/article/view/14293. Acesso em: 6 may. 2024.