The Bibliothèque Nationale de France (BNF) initialized by king Charles V 1368, should contain all that is edited in France.
see longer article in french
External links
... both sides, we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> Generalizations The formula and its proof ...