Valerio De Angelis
A history of Cardano's formula
Summary
List of characters
History of the formula
Chronology
References
Proof of the formula
References
[I] Ron Irving, Beyond the quadratic formula, MAA 2013.
Luca Pacioli (Wikipedia)
Scipione del Ferro (Wikipedia)
Niccolò Fontana Tartaglia (Wikipedia)
The Renaissance, by Donald Allen
Gerolamo Cardano (Wikipedia)
Biography of Scipione del Ferro
O. Ore, Cardano, the gambling scholar, Princeton University Press, 1953
[G]
Simone Gindikin, Tales of mathematicians and physicists