TRUKHAN, Yu.S.; SHEREMETA, M. M. Boundedness of the l-Index of the Naftalevich–Tsuji Product. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 56, n. 2, p. 247–256, 2004. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3748. Acesso em: 6 dec. 2025.