MELGAARD, M.; ROZENBLUM, G. V. Spectral Estimates for Magnetic Operators. Mathematica Scandinavica, Berkeley, CA, United States, v. 79, p. 237–254, 1996. DOI: 10.7146/math.scand.a-12604. Disponível em: https://journals.msp.org/mscand/article/view/1067. Acesso em: 25 jul. 2026.