1. An inductive proof of Descartes’ rule of signs;Albert;The American Mathematical Monthly,1943
2. A new proof of Vincent’s theorem;Alesina;L’Enseignement Mathématique,1998
3. Addendum to the paper “A new proof of Vincent’s theorem”;Alesina;L’Enseignement Mathématique,1999
4. Hyperbolic Geometry;Anderson,1999
5. La regola dei segni dall’ enunciato di R. Descartes (1637) alla dimostrazione di C.F. Gauss (1828);Bartolozzi;Archive for History of Exact Sciences,1993