Lagarias, Jeffrey C.; Richardson, Thomas J. (1997). “Multivariate descartes rule of signs and sturmfels’s challenge problem”. 《The Mathematical Intelligencer》 (영어) 19 (3): 9–15. doi:10.1007/BF03025343. ISSN0343-6993.
Komornik, Vilmos (2006). “Another Short Proof of Descartes's Rule of Signs”. 《The American Mathematical Monthly》 (영어) 113 (9): 829–830. doi:10.1080/00029890.2006.11920371. ISSN0002-9890.
Lagarias, Jeffrey C.; Richardson, Thomas J. (1997). “Multivariate descartes rule of signs and sturmfels’s challenge problem”. 《The Mathematical Intelligencer》 (영어) 19 (3): 9–15. doi:10.1007/BF03025343. ISSN0343-6993.
Komornik, Vilmos (2006). “Another Short Proof of Descartes's Rule of Signs”. 《The American Mathematical Monthly》 (영어) 113 (9): 829–830. doi:10.1080/00029890.2006.11920371. ISSN0002-9890.