@article{GDZPPN002190753,
title = {Non-linear initial data for second and higher order semi-linear elliptic equations.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {272},
year = {1975},
pages = {1-14},
zbl = {0311.35045},
url = {http://dml.mathdoc.fr/item/GDZPPN002190753}
}
Conlan, James; Gilbert, Robert P. Non-linear initial data for second and higher order semi-linear elliptic equations.. Journal für die reine und angewandte Mathematik, Tome 272 (1975) pp. 1-14. http://gdmltest.u-ga.fr/item/GDZPPN002190753/