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Liu, Y., Marchioro, P., Petreschi, R. et al. Theoretical results on at most 1-bend embeddability of graphs. Acta Mathematicae Applicatae Sinica 8, 188–192 (1992). https://doi.org/10.1007/BF02006154
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DOI: https://doi.org/10.1007/BF02006154