[1] R. Magnanini, J. Prajapat and S. Sakaguchi.
Stationary isothermic surfaces and uniformly dense domains.
Trans. Amer. Math. Soc.358(2006)4821-4841.
MR 2231874. Abstract, references, and article information View Article:PDF
[2] Peter J. Vassiliou.
Vessiot structure for manifolds of $(p,q)$-hyperbolic type: Darboux integrability and symmetry.
Trans. Amer. Math. Soc.353(2001)1705-1739.
MR 1813593. Abstract, references, and article information View Article:PDF
This article is available free of charge
