@article{10_2298_FIL2203763M,
     author = {Nedra Moalla and Wafa Selmi},
     title = {Some essential spectra of unbounded operator matrices pencils with non-diagonal domain and application},
     journal = {Filomat},
     pages = {763 },
     year = {2022},
     volume = {36},
     number = {3},
     doi = {10.2298/FIL2203763M},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.2298/FIL2203763M/}
}