LOPOTKO, O. V. Integral representation of even positive-definite functions of one variable. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 62, n. 2, p. 281 – 284, 2010. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2865. Acesso em: 5 dec. 2025.