BIKELIS, A. Two inequalities for the multivariate characteristic functions. Lithuanian Mathematical Journal, [S. l.], v. 10, n. 1, p. 5–12, 1970. DOI: 10.15388/LMJ.1970.20831. Disponível em: https://www.zurnalai.vu.lt/LMJ/article/view/20831. Acesso em: 3 may. 2025.