Bertrand, Benoît Max Planck Institute for Mathematics, Max Planck Society;
Brugallé, Erwan Max Planck Institute for Mathematics, Max Planck Society;
Bertrand, B., & Brugallé, E. (2006). A Viro theorem without convexity hypothesis for trigonal curves. International Mathematics Research Notices, 21: 87604, pp. 1-33.