1. Skew Field Constructions;Cohn,1977
2. On the zeros of polynomials over division rings;Gordon;Trans. Amer. Math. Soc.,1965
3. Correction;Gordon;Trans. Amer. Math. Soc.,1966
4. Structure of Rings;Jacobson,1956
5. N. Jacobson and D. Saltman, “Finite Dimensional Division Algebras,” Springer-Verlag, Berlin/Heidelberg/New York, to appear.