Helgason, S. (1984). Groups and Geometric Analysis, Academic Press.
Ikeda, N., and Watanabe, S. (1989). Stochastic Differential Equations and Diffusion Processes, North-Holland.
Kunita, H. (1990), Stochastic Flows and Stochastic Differential Equations, Cambridge University Press.
Liao, M. (1992). Existence of isometric stochastic flows. In M. Pinsky and V. Wihstutz (eds.), Diffusion Processes and the Related Problems in Analysis, Vol. 2, Birkhäuser, pp. 95–109.