1. Complex Analysis;Ahlfors,1966
2. Extending immersions of the circle;Blank,1967
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4. The folded ribbon theorem. A contribution to the study of immersed circles;Francis;Trans. Amer. Math. Soc.,1969
5. Small sets supporting Fary embeddings of planar graphs;de Fraysseix;Proc. 20th Ann. Symp. Th. Comput.,1988