4 books • 3 series
Differential Geometry of Lightlike Submanifolds (Frontiers in Mathematics)
Null Curves And Hypersurfaces Of Semi-riemannian Manifolds
Symmetries of Spacetimes and Riemannian Manifolds (Mathematics and Its Applications, #487)
Lightlike Submanifolds of Semi-Riemannian Manifolds and Applications (Mathematics and Its Applications, #364)