FREUD, G. Eine Bemerkung zur asymptotischen Darstellung von Orthogonalpolynomen. Mathematica Scandinavica, Berkeley, CA, United States, v. 5, p. 285–290, 1957. DOI: 10.7146/math.scand.a-10507. Disponível em: https://journals.msp.org/mscand/article/view/2818. Acesso em: 8 sep. 2026.