@article{ASNSP_1972_3_26_2_391_0, author = {Piccinini, Livio C. and Spagnolo, Sergio}, title = {On the H\"older continuity of solutions of second order elliptic equations in two variables}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {391--402}, publisher = {Scuola normale superiore}, volume = {Ser. 3, 26}, number = {2}, year = {1972}, zbl = {0237.35028}, mrnumber = {361422}, language = {en}, url = {archive.numdam.org/item/ASNSP_1972_3_26_2_391_0/} }
Piccinini, L. C.; Spagnolo, S. On the Hölder continuity of solutions of second order elliptic equations in two variables. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 2, pp. 391-402. http://archive.numdam.org/item/ASNSP_1972_3_26_2_391_0/
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