@article{1181072243,
author = {Ibrahim, Sobhy El-Sayed},
title = {The Point Spectra and Regularity Fields of Non-Self-Adjoint Quasi-Differential Operators},
journal = {Rocky Mountain J. Math.},
volume = {25},
number = {4},
year = {1995},
pages = { 685-699},
language = {en},
url = {http://dml.mathdoc.fr/item/1181072243}
}
Ibrahim, Sobhy El-Sayed. The Point Spectra and Regularity Fields of Non-Self-Adjoint Quasi-Differential Operators. Rocky Mountain J. Math., Tome 25 (1995) no. 4, pp. 685-699. http://gdmltest.u-ga.fr/item/1181072243/