Dacorogna, BernardMarcellini, PaoloPaolini, Emanuele2011-12-162011-12-162011-12-16201010.57262/die/1356019386https://infoscience.epfl.ch/handle/20.500.14299/74950WOS:000284492900003A Dirichlet problem for orthogonal Hessians in two dimensions is explicitly solved, by characterizing all piecewise C-2 functions u Omega subset of R-2 -> R with orthogonal Hessian in terms of a property named "second order angle condition" as in (1 1)text::journal::journal article::research article