@article{ASNSP_1972_3_26_2_283_0, author = {Hager, R. A. and Ross, J.}, title = {A regularity theorem for linear second order elliptic divergence equations}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {283--290}, publisher = {Scuola normale superiore}, volume = {Ser. 3, 26}, number = {2}, year = {1972}, zbl = {0256.35027}, mrnumber = {374643}, language = {en}, url = {archive.numdam.org/item/ASNSP_1972_3_26_2_283_0/} }
Hager, R. A.; Ross, J. A regularity theorem for linear second order elliptic divergence equations. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 26 (1972) no. 2, pp. 283-290. http://archive.numdam.org/item/ASNSP_1972_3_26_2_283_0/
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