Halbeisen, Lorenz; Hungerbühler, Norbert A theorem of Fermat on congruent number curves. (English) Zbl 1440.11094 Hardy-Ramanujan J. 41, 15-21 (2018). MSC: 11G05 11D25 PDFBibTeX XMLCite \textit{L. Halbeisen} and \textit{N. Hungerbühler}, Hardy-Ramanujan J. 41, 15--21 (2018; Zbl 1440.11094) Full Text: arXiv Link
Halbeisen, L.; Hungerbühler, N. On generalized Carmichael numbers. (English) Zbl 1002.11006 Hardy-Ramanujan J. 22, 8-22 (1999). MSC: 11A51 11A07 11N25 PDFBibTeX XMLCite \textit{L. Halbeisen} and \textit{N. Hungerbühler}, Hardy-Ramanujan J. 22, 8--22 (1999; Zbl 1002.11006)