POLETAEV , G. S. Convolution-type integral equation with two kernels and its abstract analog. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 8, p. 1065–1078, 1992. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8035. Acesso em: 7 apr. 2025.