@article{2468,
author = {van Vleck, F.S.},
title = {A bifurcation theorem for a class of differential equations},
journal = {Portugaliae mathematica},
volume = {24},
year = {1965},
pages = {125-130},
zbl = {0161.28901},
mrnumber = {0222369},
language = {en},
url = {http://dml.mathdoc.fr/item/2468}
}
van Vleck, F.S. A bifurcation theorem for a class of differential equations. Portugaliae mathematica, Tome 24 (1965) pp. 125-130. http://gdmltest.u-ga.fr/item/2468/