Volume 16, Issue 1 Nedra Moalla Wafa Selmi On a characterization of Jeribi, Rakočević, Schechter, Schmoeger and Wolf essential spectra of a 3⨉3 block operator matrices with non diagonal domain and application 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 Nedra Moalla Wafa Selmi Find more articles with the same keywords 3⨉3 block operator matrices non diagonal domain Fredholm perturbations essential spectra three-group transport theory Find more articles with the same subject classes 47A10 47A53 34K08