[1] CARPENTER J.: Finiteness Theorems for Forms over Number Fields. Dissertation, LSU Baton Rouge, La., 1989. MR 2637678

[2] CZOGALA A.: Witt Rings of Algebraic Number Fields. (Polish). Dissertation, Silesian University, Katowice, 1987.

[3] CZOGALA A.: On reciprocity equivalence of quadratic number fields. Acta Arith. 58 (To appear.). MR 1111088 | Zbl 0733.11012

[4] HARRISON D. K.: Witt Rings. Univ. of Kentucky, 1970.

[5] JACOB B., WARE R.: Realizing dyadic factors of elementary type Witt rings and pro-2 Galois groups. Preprint (1989). MR 1128705

[6] PERLIS R., SZYMICZEK K., CONNER P. E., LITHERLAND R.: Matching Witts with global fields. Preprint (1989). MR 1260721

[7] SZCZEPANIK L.: On W R-equivalence of quadratic extensions of W R-equivalent fields. Univ. Slanski w Katowicach, Prace mat. 10 (1980), p. 17-22. MR 0594923

[8] SZYMICZEK K.: Quadratic forms over fields. Dissert. Math. 152 (1977), 1-63. MR 0450199

[9] SZYMICZEK K.: Witt equivalence of global fields. Commun. Algebra 19 (1991), 1125-1149. MR 1102331

[10] SZYMICZEK K.: Matching Witts locally and globally. Math. Slovaca 41 (1991), 315-330. MR 1126669 | Zbl 0766.11023