@article{GDZPPN00221637X, title = {H\"older Continuity of Solutions of Elliptic Systems.}, journal = {Manuscripta mathematica}, volume = {4}, year = {1971}, pages = {299-308}, zbl = {0223.35044}, url = {http://dml.mathdoc.fr/item/GDZPPN00221637X} }
Widman, Kjell-Ove. Hölder Continuity of Solutions of Elliptic Systems.. Manuscripta mathematica, Tome 4 (1971) pp. 299-308. http://gdmltest.u-ga.fr/item/GDZPPN00221637X/