@article{1077375637,
author = {Krall, Allan M.},
title = {Existence of solutions of nonhomogeneous linear differential
equations of second order in $L\sp{2}$},
journal = {Duke Math. J.},
volume = {32},
number = {1},
year = {1965},
pages = { 97-102},
language = {en},
url = {http://dml.mathdoc.fr/item/1077375637}
}
Krall, Allan M. Existence of solutions of nonhomogeneous linear differential
equations of second order in $L\sp{2}$. Duke Math. J., Tome 32 (1965) no. 1, pp. 97-102. http://gdmltest.u-ga.fr/item/1077375637/