[1] CRAVEN T. C.-ROSENBERG A.-WARE R.: The map of the Witt ring of a domain into the Witt ring of its field of fractions. Proc. Amer. Math. Soc. 51 (1975), 25-30. MR 0384789

[2] CZOGAŁA A.: Generators of the Witt groups of algebraic integers. Ann. Math. Sil. 12 (1998), 105-121. MR 1673080

[3] GEROLDINGER A.-HALТER-KOCH F.-KACZOROWSKI J.: Non-unique factorization in orders of global fields. J. Reine Angew. Math. 459 (1995), 89-118. MR 1319518

[4] MAТSUMURA H.: Commutative Ring Theory. Cambridge Univ. Press, Cambridge, 1986. MR 0879273

[5] MILNOR J.-HUSEMOLLER D.: Symmetric Bilinear Forms. Springer-Verlag, Berlin-Heidelberg-New York, 1973. MR 0506372

[6] NARKIEWICZ W.: Elementary and Analytic Theory of Algebraic Numbers. (2nd ed.), PWN/Springеr-Vеrlag, Warszawa/Berlin-Heidеlberg-New York, 1990. MR 1055830 | Zbl 0717.11045

[7] NEUKIRCH J.: Algebraic Number Theory. Springer-Verlag, Berlin, 1999. MR 1697859

[8] SZYMICZEK K.: Problem session. The 4th Czech and Polish Conference on Number Theory, Cieszyn, June 11-14, 2002; Ann. Math. Sil. 16 (2003), 79-81. MR 1800217