RUGIRI, Peter Githara. On condition of quasisimilar, quasinormal and pure dominant operators in existence of essential spectra in an infinite dimensional Hilbert spaces. Journal of Mathematics and Data Science (JMDS), [S. l.], v. 1, n. 1, p. 1–8, 2023. DOI: 10.51317/jmds.v1i1.423. Disponível em: https://journals.editononline.com/index.php/jmds/article/view/423. Acesso em: 29 apr. 2026.