Spectral properties for polynomial and matrix operators involving demicompactness classes : doi:10.17398/2605-5686.33.1.11. Extr. Math. [Internet]. 2018 Jun. 1 [cited 2024 Dec. 21];33(1):11-32. Available from: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.33.1.11