1. Annals of Mathematics Studies, No. 46;Borel, Armand,1960
2. Actualit\'{e}s Scientifiques et Industrielles [Current Scientific and Industrial Topics], No. 1152;Chevalley, Claude,1951
3. Some basic theorems on algebraic groups;Rosenlicht, Maxwell;Amer. J. Math.,1956
4. Some remarks on Lüroth’s theorem;Samuel, Pierre;Mem. Coll. Sci. Univ. Kyoto Ser. A. Math.,1953