@article{1181071653,
author = {Ibrahim, Sobhy El-Sayed},
title = {On the Essential Spectra of Regularly Solvable Operators in the Direct Sum Spaces},
journal = {Rocky Mountain J. Math.},
volume = {29},
number = {4},
year = {1999},
pages = { 609-644},
language = {en},
url = {http://dml.mathdoc.fr/item/1181071653}
}
Ibrahim, Sobhy El-Sayed. On the Essential Spectra of Regularly Solvable Operators in the Direct Sum Spaces. Rocky Mountain J. Math., Tome 29 (1999) no. 4, pp. 609-644. http://gdmltest.u-ga.fr/item/1181071653/