ALEKSANDROVICH, I. N.; SIDOROV, M. V. Differential operators specifying the solution of an elliptictype iterated equation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 71, n. 3, p. 433–440, 2019. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1449. Acesso em: 5 dec. 2025.