Hoffmann, Detlev W.; Leep, David B. Sums of squares in nonreal commutative rings. (English) Zbl 1401.11080 Isr. J. Math. 221, No. 2, 803-835 (2017). Reviewer: Albrecht Pfister (Mainz) MSC: 11E25 11E04 13F20 13F25 × Cite Format Result Cite Review PDF Full Text: DOI
Taussky, Olga The many aspects of the Pythagorean triangles. (English) Zbl 0493.10018 Linear Algebra Appl. 43, 285-295 (1982). Reviewer: Alexander Prestel (Konstanz) MSC: 11D09 11E16 17A35 × Cite Format Result Cite Review PDF Full Text: DOI
Hsia, J. S. On the Witt ring and some arithmetical invariants of quadratic forms. (English) Zbl 0266.10019 J. Number Theory 5, 339-355 (1973). MSC: 11E16 11P05 13F05 15A63 13H99 × Cite Format Result Cite Review PDF Full Text: DOI