@article{GDZPPN002217767,
title = {A Note on Pairs of Solutions of a Nonlinear Sturm-Liouville Problem.},
journal = {Manuscripta mathematica},
volume = {11},
year = {1973},
pages = {273-282},
zbl = {0276.34019},
url = {http://dml.mathdoc.fr/item/GDZPPN002217767}
}
Rabinowitz, Paul H. A Note on Pairs of Solutions of a Nonlinear Sturm-Liouville Problem.. Manuscripta mathematica, Tome 11 (1973) pp. 273-282. http://gdmltest.u-ga.fr/item/GDZPPN002217767/