@article{01775571,
title = {Positive solutions and nonlinear eigenvalue problems for retarded second order differential equations.},
journal = {Electronic Journal of Differential Equations (EJDE) [electronic only]},
volume = {2002},
year = {2002},
zbl = {1012.34063},
language = {en},
url = {http://dml.mathdoc.fr/item/01775571}
}
Karakostas, G.L.; Tsamatos, P.Ch. Positive solutions and nonlinear eigenvalue problems for retarded second order differential equations.. Electronic Journal of Differential Equations (EJDE) [electronic only], Tome 2002 (2002) . http://gdmltest.u-ga.fr/item/01775571/