1. Interscience Tracts in Pure and Applied Mathematics, No. 13;Nagata, Masayoshi,1962
2. Publications de l'Universit\'{e} de Nancago, No. VIII;Serre, Jean-Pierre,1968
3. \bysame, Cohomologie Galoisienne, Mimeographed notes, Collège de France, 1963 (also as Lecture Notes in Mathematics, No. 5, Springer-Verlag, 1964).
4. I. M. Vinogradov, The method of trigonometrical sums in the theory of numbers, Interscience, New York.
5. Note on a paper of Lang concerning quasi algebraic closure;Nagata, Masayoshi;Mem. Coll. Sci. Univ. Kyoto Ser. A. Math.,1957