ZABREIKO, P. A formula of spectral radius of integral Volterra operators. Lithuanian Mathematical Journal, [S. l.], v. 7, n. 2, p. 281–287, 1967. DOI: 10.15388/LMJ.1967.19956. Disponível em: https://www.journals.vu.lt/LMJ/article/view/19956.. Acesso em: 5 may. 2024.