MIROTIN , A. P. Positive half-characters and the Laplace transformation . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 5, p. 647–653, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/7961. Acesso em: 17 feb. 2026.