Volume 8, Issue 1 Boulbeba Abdelmoumen Essential spectra of some matrix operators by means of measures of weak noncompactness Downloads Abstract PDF Full article PDF DOI { copied = true; setTimeout(() => copied = false, 2000) })" :aria-label="copied ? 'DOI copied' : 'Copy DOI'" :title="copied ? 'Copied' : 'Copy DOI'" > Find all available articles from these authors Boulbeba Abdelmoumen Find more articles with the same keywords measures of weak noncompactness in Banach spaces Fredholm<\i> operators essential spectra Find more articles with the same subject classes 28A78 47A10 47A53 47A55 47N20