Fröberg, Ralf. “Hilbert Coefficients of Quadratic Algebras”. Journal of Experimental Mathematics 1, no. 2 (August 30, 2025): 315–321. Accessed August 24, 2026. https://ticket17180.pkpmisc01.publicknowledgeproject.org/index.php/jem/article/view/Vol-1Issue-2Paper-7.