@article{1077476770,
author = {Levinson, Norman},
title = {Addendum to ``A simplified proof of the expansion theorem
for singular second order linear differential equations''},
journal = {Duke Math. J.},
volume = {18},
number = {1},
year = {1951},
pages = { 719-722},
language = {en},
url = {http://dml.mathdoc.fr/item/1077476770}
}
Levinson, Norman. Addendum to “A simplified proof of the expansion theorem
for singular second order linear differential equations”. Duke Math. J., Tome 18 (1951) no. 1, pp. 719-722. http://gdmltest.u-ga.fr/item/1077476770/