@article{2549,
author = {Gilbert, R.P. and Howard, H.C.},
title = {On a class of elliptic partial differential equations},
journal = {Portugaliae mathematica},
volume = {26},
year = {1967},
pages = {353-373},
zbl = {0195.11201},
language = {en},
url = {http://dml.mathdoc.fr/item/2549}
}
Gilbert, R.P.; Howard, H.C. On a class of elliptic partial differential equations. Portugaliae mathematica, Tome 26 (1967) pp. 353-373. http://gdmltest.u-ga.fr/item/2549/