KULKARNI, R. G. A simpler method to get only the true solutions of cubic and quartic equations using Tschirnhaus transformation. Annales Universitatis Paedagogicae Cracoviensis Studia Mathematica, [S. l.], v. 21, p. 51–56, 2022. Disponível em: https://studmath.uken.krakow.pl/article/view/9500. Acesso em: 7 may. 2024.