Geodesic
A~generalization of a~theorem of Lewy on harmonic mappings
Matematičeskie zametki, Tome 13 (1973) no. 2, pp. 189-194.

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It is shown that every one-to-one pluriharmonic mapping of a neighborhood of $0\in R^4$ into itself has nonvanishing Jacobian. 
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     author = {M. Naser},
     title = {A~generalization of a~theorem of {Lewy} on harmonic mappings},
     journal = {Matemati\v{c}eskie zametki},
     pages = {189--194},
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     year = {1973},
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M. Naser. A~generalization of a~theorem of Lewy on harmonic mappings. Matematičeskie zametki, Tome 13 (1973) no. 2, pp. 189-194. http://geodesic.mathdoc.fr/item/MZM_1973_13_2_a2/