Bertrand, Benoît Max Planck Institute for Mathematics, Max Planck Society;
Brugallé, Erwan Max Planck Institute for Mathematics, Max Planck Society;
Bertrand, B., & Brugallé, E. (2008). A nonalgebraic patchwork. Mathematische Zeitschrift, 259(3), 481-486. doi:10.1007/s00209-007-0232-2.