1. A theorem on holonomy;Ambrose, W.;Trans. Amer. Math. Soc.,1953
2. H. Cartan, Notions d’algèbre différentielle, Colloque de Topologie de Bruxelles, 1950, pp. 16-27.
3. C. Chevalley, Lie groups. I, Princeton, Princeton University Press, 1946.
4. Geodesics of bounded, symmetric domains;Hermann, Robert;Comment. Math. Helv.,1961
5. Geodesics and harmonic functions on symmetric spaces;Karpelevič, F. I.;Dokl. Akad. Nauk SSSR,1959