1. T. Adati, On subprojective spaces, I,Tôhoku Math. J. 2 (1951), 159–173.MR 14—86
2. G. M. Fulton, Parallel vector fields.Proc. Amer. Math. Soc. 16 (1965), 136–137.MR 30 # 2435
3. M. Hashiguchi, Semi symmetric connections and spaces of negative constant curvature,Science Reports of Kagoshima Univ. 15 (1966), 7–11.MR 35 # 4851
4. H. Izumi, OnP *-Finsler spaces, I,Memo. Defence Academy,16 (1976), 133–138.
5. M. Matsumoto, The theory of Finsler connections,Publ. of the study group of geometry,5, College of Liberal Arts and Science, Okayama Univ. (1970).MR 42 # 2409