BURENKOV, V. I.; TARARYKOVA, T. V. On the spectrum of a nonlinear operator associated with calculation of the norm of a linear vector-functional. Eurasian Mathematical Journal, [S. l.], v. 5, n. 2, p. 132–138, 2014. Disponível em: https://emj.enu.kz/index.php/main/article/view/575. Acesso em: 3 jan. 2026.