References
- Bergman , George M. and Hrushovski , Ehud . 1998 . Bergman and Ehud Hrushovski,Linear ultrafilters . Communications in Algebra , 26 ( 9 ) : 4079 – 4113 .
- Cohn , P.M. 1995 . “ Skew fields.Theory of general division rings ” . In Encyclopedia of Mathematics and its Applications , Vol. 57 , Cambridge University Press . MR97d: 12003
- Matignon , Michel . 1987 . Genre et genre résiduel des corps de fonctions valués . manuscripta mathematica , 58 : 179 – 214 . MR89a: 11063
- Jack , Ohm . 1996 . On the vector space defect for valued field extensions . Proceedings of the Special Semester . Spring 1996 . Contemp : Baton Rouge . to appear in,Real Algebraic Geometry and Ordered Structures, Math., Amer. Math. Soc