@article{1181073058,
author = {Headley, V.B.},
title = {Nodal oscillation and weak oscillation of elliptic equations of order $2m$},
journal = {Rocky Mountain J. Math.},
volume = {20},
number = {4},
year = {1990},
pages = { 1003-1016},
language = {en},
url = {http://dml.mathdoc.fr/item/1181073058}
}
Headley, V.B. Nodal oscillation and weak oscillation of elliptic equations of order $2m$. Rocky Mountain J. Math., Tome 20 (1990) no. 4, pp. 1003-1016. http://gdmltest.u-ga.fr/item/1181073058/