Grytczuk, Aleksander Monoids connected with Euler’s Diophantine equation. (English) Zbl 1097.11530 Missouri J. Math. Sci. 10, No. 2, 91-94 (1998). MSC: 11D41 PDFBibTeX XMLCite \textit{A. Grytczuk}, Missouri J. Math. Sci. 10, No. 2, 91--94 (1998; Zbl 1097.11530)
Grytczuk, Aleksander Note on a Pythagorean ring. (English) Zbl 1097.11529 Missouri J. Math. Sci. 9, No. 2, 83-89 (1997). MSC: 11D09 PDFBibTeX XMLCite \textit{A. Grytczuk}, Missouri J. Math. Sci. 9, No. 2, 83--89 (1997; Zbl 1097.11529)