参考文献

Steven Harris, Conformally stationary spacetimes, Class. Quantum Grav. 9 (1992) 1823-1827
Kobayashi, Nomizu, Foundations of Differential Geometry Volume I
S.Helgason, Differential Geometry, Lie Groups, and Symmetric Spaces
Richard S. Palais, On the Existence of Slices for Actions of Non-Compact Lie Groups, Annals of Mathematics, Second Series, Vol. 73, No. 2 (Mar., 1961), pp. 295-323