HANSEN, Frank; PECARIC, Josip; PERIC, Ivan. Jensen’s operator inequality and its converses. Mathematica Scandinavica, Berkeley, CA, United States, v. 100, n. 1, p. 61–73, 2007. DOI: 10.7146/math.scand.a-15016. Disponível em: https://journals.msp.org/mscand/article/view/681. Acesso em: 24 jul. 2026.