SOROKINA, N. G. On the normal solvability of the Tricomi problem for an equation of the Lavrentyev — Bitsadze type. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 1, p. 34–42, 1970. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8476. Acesso em: 6 dec. 2025.