@article{GDZPPN00206877X,
title = {A maximum principle for biharmonic functions in Lipschitz and C1 domains.},
journal = {Commentarii mathematici Helvetici},
volume = {68},
year = {1993},
pages = {385-414},
zbl = {0794.31005},
url = {http://dml.mathdoc.fr/item/GDZPPN00206877X}
}
Pipher, J.; Verchota, G. A maximum principle for biharmonic functions in Lipschitz and C1 domains.. Commentarii mathematici Helvetici, Tome 68 (1993) pp. 385-414. http://gdmltest.u-ga.fr/item/GDZPPN00206877X/