@article{1029000901,
author = {Bobisud, L. E.},
title = {The distance to vertical asymptotes for solutions of second-order differential equations.},
journal = {Michigan Math. J.},
volume = {19},
number = {1},
year = {1972},
pages = { 277-283},
language = {en},
url = {http://dml.mathdoc.fr/item/1029000901}
}
Bobisud, L. E. The distance to vertical asymptotes for solutions of second-order differential equations.. Michigan Math. J., Tome 19 (1972) no. 1, pp. 277-283. http://gdmltest.u-ga.fr/item/1029000901/