@article{1255380673,
author = {Feller, William},
title = {Generalized second order differential operators and their lateral conditions},
journal = {Illinois J. Math.},
volume = {1},
number = {1},
year = {1957},
pages = { 459-504},
language = {en},
url = {http://dml.mathdoc.fr/item/1255380673}
}
Feller, William. Generalized second order differential operators and their lateral conditions. Illinois J. Math., Tome 1 (1957) no. 1, pp. 459-504. http://gdmltest.u-ga.fr/item/1255380673/