@article{ASNSP_1959_3_13_2_115_0, author = {Nirenberg, L.}, title = {On elliptic partial differential equations}, journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche}, pages = {115--162}, publisher = {Scuola normale superiore}, volume = {Ser. 3, 13}, number = {2}, year = {1959}, mrnumber = {109940}, zbl = {0088.07601}, language = {en}, url = {http://www.numdam.org./item/ASNSP_1959_3_13_2_115_0/} }