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@article{MS2_1975__36_166400, author = {Clifford J. Earle}, title = {Some remarks on the {Beltrami} equation.}, journal = {Mathematica Scandinavica}, pages = {45--49}, publisher = {mathdoc}, volume = {36}, year = {1975}, zbl = {0303.30019}, url = {http://geodesic.mathdoc.fr/item/MS2_1975__36_166400/} }
Clifford J. Earle. Some remarks on the Beltrami equation.. Mathematica Scandinavica, Tome 36 (1975), pp. 45-49. http://geodesic.mathdoc.fr/item/MS2_1975__36_166400/