[1] P. E. Conner R. Perlis, and K. Szymiczek: Wild sets and 2-ranks of class groups. Acta Arith. 79 (1997), 83-91. MR 1438119

[2] A. Czogala: On reciprocity equivalence of quadratic number fields. Acta Arith. 58 (1991), 27-46. MR 1111088 | Zbl 0733.11012

[3] A. Czogala: Witt rings of Hasse domains of global fields. J. Algebra 244 (2001), 604-630. MR 1859041 | Zbl 0984.11016

[4] E. Hecke: Vorlesungen über die Theorie der algebraischen Zahlen. Akademische Verlagsgesellschaft, Leipzig 1923.

[5] S. Jakubec F. Marko, and K. Szymiczek: Parity of class numbers and Witt equivalence of quartic fields. Math. Comput. 64 (1995), 1711-1715. Corrigendum, ibid. 66 (1997), 927. MR 1308455

[6] K. Koziol: On a decomposition of the Witt group into direct sum of cyclic groups. Ann. Math. Siles. 6 (1992), 7-8. MR 1217335 | Zbl 0833.11014

[7] R. Kučera, K. Szymiczek: Witt equivalence of cyclotomic fields. Math. Siovaca 42 (1992), 663-676. MR 1202180

[8] T. Y. Lam: The algebraic theory of quadratic forms. Second printing. Benjamin, Reading, Mass. 1980. MR 0634798 | Zbl 0437.10006

[9] J. Milnor D. Husemoller: Symmetric Bilinear Forms. Springer Verlag, Berlin - Heidelberg - New York 1973. MR 0506372

[10] S. Nakano: On ideal class groups of algebraic number fields. J. Reine Angew. Math. 358 (1985), 61-75. MR 0797674 | Zbl 0559.12004

[11] W. Narkiewicz: Elementary and Analytic Theory of Algebraic Numbers. Second ed. PWN and Springer-Verlag, Warszawa and Berlin Heidelberg New York 1990. MR 1055830 | Zbl 0717.11045

[12] R. Parimala: Witt groups of conies, elliptic, and hyperelliptic curves. J. Number Theory 28 (1988), 69-93. MR 0925609

[13] R. Perlis K. Szymiczek P. E. Conner, and R. Litherland: Matching Witts with global fields. Contemp. Math. 155 (1994), 365-387. MR 1260721

[14] A. Pfister: Quadratic lattices in function fields of genus 0. Proc. London Math. Soc. (3) 66 (1993), 257-278. MR 1199066 | Zbl 0808.11025

[15] W. Scharlau: Quadratic and Hermitian Forms. Springer Verlag, Berlin-Heidelberg-New York - Tokyo, 1985. MR 0770063 | Zbl 0584.10010

[16] K. Szymiczek: Quadratic forms over fields. Dissert. Math. 52 (1977), 1-63. MR 0450199 | Zbl 0371.12017

[17] K. Szymiczek: Witt equivalence of global fields. Commun. Algebra 19 (4) (1991), 1125-1149. MR 1102331 | Zbl 0724.11020

[18] K. Szymiczek: 2-ranks of class groups of Witt equivalent number fields. Ann. Math. Siles. 12 (1998), 53-64. MR 1673064 | Zbl 0926.11083

[19] K. Szymiczek: p-ranks of class groups of Witt equivalent number fields. J. Number Theory 78 (1999), 99-106. MR 1706917 | Zbl 0988.11054

[20] K. Szymiczek: Conner's level condition. In: Algebraic Number Theory and Diophantine Analysis, Eds. Franz Halter-Koch, Robert F. Tichy. Walter de Gruyter, Berlin - New York 2000, 445-452. MR 1770476 | Zbl 0973.11096