@article{GDZPPN002347296,
title = {Elliptic Differential Problems with High Order Boundary Conditions.},
journal = {Mathematica Scandinavica},
volume = {13},
year = {1963},
pages = {178-188},
zbl = {0125.05503},
url = {http://dml.mathdoc.fr/item/GDZPPN002347296}
}
Mullikin, A.L.; Smith, K.T. Elliptic Differential Problems with High Order Boundary Conditions.. Mathematica Scandinavica, Tome 13 (1963) pp. 178-188. http://gdmltest.u-ga.fr/item/GDZPPN002347296/