@article{1102983771,
author = {Headley, V. B. and Swanson, C. A.},
title = {Oscillation criteria for elliptic equations.},
journal = {Pacific J. Math.},
volume = {27},
number = {3},
year = {1968},
pages = { 501-506},
language = {en},
url = {http://dml.mathdoc.fr/item/1102983771}
}
Headley, V. B.; Swanson, C. A. Oscillation criteria for elliptic equations.. Pacific J. Math., Tome 27 (1968) no. 3, pp. 501-506. http://gdmltest.u-ga.fr/item/1102983771/