RASULOV, T. H.; MUMINOV, M. I.; HASANOV, M. On the spectrum of a model operator in Fock space. Methods of Functional Analysis and Topology, [S. l.], v. 15, n. 4, p. 369–383, 2009. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/431. Acesso em: 16 dec. 2025.