Lewy's theorem fails in higher dimensions.
Mathematica Scandinavica, Tome 69 (1991) no. 1, p. 166
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ZblJohn C. Wood. Lewy's theorem fails in higher dimensions.. Mathematica Scandinavica, Tome 69 (1991) no. 1, p. 166. http://geodesic.mathdoc.fr/item/MS2_1991__69_1_167176/
@article{MS2_1991__69_1_167176,
author = {John C. Wood},
title = {Lewy's theorem fails in higher dimensions.},
journal = {Mathematica Scandinavica},
pages = {166--166},
year = {1991},
volume = {69},
number = {1},
zbl = {0711.31003},
url = {http://geodesic.mathdoc.fr/item/MS2_1991__69_1_167176/}
}