@article{1102968149,
author = {Kreith, Kurt and Travis, Curtis C.},
title = {Oscillation criteria for selfadjoint elliptic equations.},
journal = {Pacific J. Math.},
volume = {43},
number = {3},
year = {1972},
pages = { 743-753},
language = {en},
url = {http://dml.mathdoc.fr/item/1102968149}
}
Kreith, Kurt; Travis, Curtis C. Oscillation criteria for selfadjoint elliptic equations.. Pacific J. Math., Tome 43 (1972) no. 3, pp. 743-753. http://gdmltest.u-ga.fr/item/1102968149/