@article{ASNSP_1982_4_9_1_159_0, author = {Reimann, H. M.}, title = {A rotation invariant differential equation for vector fields}, journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze}, pages = {159--174}, publisher = {Scuola normale superiore}, volume = {Ser. 4, 9}, number = {1}, year = {1982}, zbl = {0491.35027}, mrnumber = {664106}, language = {en}, url = {http://www.numdam.org/item/ASNSP_1982_4_9_1_159_0/} }