1 |
G. S. Birman and G. M. Desideri, Laplacian on mean curvature vector fields for some non-lightlike surfaces in the 3-dimensional Lorentzian space, Proceedings of the Seventh 'Dr. Antonio A. R. Monteiro' Congress of Mathematics (Spanish), 27-33, Univ. Nac. del Sur, Bahia Blanca, 2003
|
2 |
H. S. M. Coxeter, Introduction to Geometry, second edition, John Wiley & Sons, Inc., New York, 1969
|
3 |
B. O`Neill, Semi-Riemannian geometry, With applications to relativity. Pure and Applied Mathematics, 103. Academic Press, Inc., New York, 1983
|
4 |
D. J. Struik, Lectures on Classical Differential Geometry, second edition, Dover Publica- tions, Inc., New York, 1961
|