@article{702180,
title = {Asymptotic formulas for the solutions of linear differential equations of the second order},
booktitle = {Differential Equations and Their Applications},
series = {GDML\_Books},
publisher = {Publishing House of the Czechoslovak Academy of Sciences},
address = {Prague},
year = {1963},
pages = {131-135},
mrnumber = {MR0170064},
zbl = {0138.32503},
url = {http://dml.mathdoc.fr/item/702180}
}
Ráb, M. Asymptotic formulas for the solutions of linear differential equations of the second order, dans Differential Equations and Their Applications, GDML_Books, (1963), pp. 131-135. http://gdmltest.u-ga.fr/item/702180/