@article{1077474665,
author = {Levinson, Norman},
title = {The asymptotic nature of solutions of linear systems of
differential equations},
journal = {Duke Math. J.},
volume = {15},
number = {1},
year = {1948},
pages = { 111-126},
language = {en},
url = {http://dml.mathdoc.fr/item/1077474665}
}
Levinson, Norman. The asymptotic nature of solutions of linear systems of
differential equations. Duke Math. J., Tome 15 (1948) no. 1, pp. 111-126. http://gdmltest.u-ga.fr/item/1077474665/