Hudde, Johannes (1659) "Epistola prima, de reductione æquationum" (First letter: on the reduction of equations). In: Descartes, René; Beaune, Florimond de; Schooten, Frans van; Hudde, Johannes; Heuraet, Hendrik van. Renati Des-Cartes Geometria. 2nd ed. vol. 1. (in Latin) Amsterdam, Netherlands: Louis and Daniel Elzevir. pp. 406–506.