Determination of surfaces in three-dimensional Minkowski and Euclidean spaces based on solutions of the sinh-Laplace equation.
Differential equations on contact riemannian manifolds
Differential operators cononically associated to a conformal structure.
Differential spaces and singularities of space-time.
Differential-geometrical conditions between geodesic curves and ruled surfaces in the Lorentz space.
Duality Principle and Special Osserman Manifolds
Dynamics of relative motion of test particles in general relativity