@MISC{POLYEQ_5.MIZ,
  AUTHOR = {Riccardi, Marco},
  TITLE = {Solution of Cubic and Quartic Equations},
  SECTION1 = {Preliminaries},
  SECTION2 = {Solution of Quadratic Equations},
  SECTION3 = {Solution of Cubic Equations},
  SECTION4 = {Solution of Quartic Equations},
  DAY = {03},
  MONTH = {March},
  YEAR = {2009},
  ADDRESS1 = {Casella Postale 49\\ 54038 Montignoso, Italy},
  SUMMARY = {In this article, the principal $n$-th root of 
  a complex number is defined, the Vieta's formulas for 
  polynomial equations of degree 2, 3 and 4 are formalized. 
  The solution of quadratic equations, the Cardan's solution 
  of cubic equations and the Descartes-Euler solution of 
  quartic equations in terms of their complex coefficients 
  are also presented \cite{Korn}.}}

