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Ryffel, Levi (2023). Curves intersecting in a circuit pattern. Topology and its applications, 332 Elsevier 10.1016/j.topol.2023.108522
Baader, S.; Feller, P.; Ryffel, L. (2023). Bouquets of curves in surfaces. Glasgow Mathematical Journal, 65(1), pp. 90-97. Cambridge University Press 10.1017/S001708952200012X
