Hsia, J. S.; Johnson, Robert P. On the representation in sums of squares for definite functions in one variable over an algebraic number field. (English) Zbl 0303.12009 Am. J. Math. 96, 448-453 (1974). MSC: 11R80 12D15 11P05 PDFBibTeX XMLCite \textit{J. S. Hsia} and \textit{R. P. Johnson}, Am. J. Math. 96, 448--453 (1974; Zbl 0303.12009) Full Text: DOI
Hsia, J. S.; Johnson, Robert P. Round and group quadratic forms over global fields. (English) Zbl 0266.10020 J. Number Theory 5, 356-366 (1973). MSC: 11E16 15A63 11R99 PDFBibTeX XMLCite \textit{J. S. Hsia} and \textit{R. P. Johnson}, J. Number Theory 5, 356--366 (1973; Zbl 0266.10020) Full Text: DOI
Hsia, J. S.; Johnson, Robert P. Round and Pfister forms over R(t). (English) Zbl 0263.10008 Pac. J. Math. 49, 101-108 (1973). MSC: 11E16 15A63 11C08 13D15 PDFBibTeX XMLCite \textit{J. S. Hsia} and \textit{R. P. Johnson}, Pac. J. Math. 49, 101--108 (1973; Zbl 0263.10008) Full Text: DOI