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MR ZblGuggenheimer, H. On focal points and limit behavior of solutions of linear differential equations. Archivum mathematicum, Tome 14 (1978) no. 3, pp. 139-143. http://geodesic.mathdoc.fr/item/ARM_1978_14_3_a1/
@article{ARM_1978_14_3_a1,
author = {Guggenheimer, H.},
title = {On focal points and limit behavior of solutions of linear differential equations},
journal = {Archivum mathematicum},
pages = {139--143},
year = {1978},
volume = {14},
number = {3},
mrnumber = {0508430},
zbl = {0403.34027},
language = {en},
url = {http://geodesic.mathdoc.fr/item/ARM_1978_14_3_a1/}
}
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