Issue No.04 - July/August (2006 vol.26)
James F. Blinn , Microsoft Research
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/MCG.2006.81
Jim Blinn discusses a good practical closed-form solution process for cubic equations and makes some observations about the relation between iterative and closed-form solutions.
Blinn, cubic equations
James F. Blinn, "How to Solve a Cubic Equation, Part 2: The 11 Case", IEEE Computer Graphics and Applications, vol.26, no. 4, pp. 90-100, July/August 2006, doi:10.1109/MCG.2006.81