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"Dual imbeddings and wrapped quasi-coverings of graphs."
Torrence D. Parsons, Tomaz Pisanski, Brad Jackson (1980)
- Torrence D. Parsons, Tomaz Pisanski, Brad Jackson:
Dual imbeddings and wrapped quasi-coverings of graphs. Discret. Math. 31(1): 43-52 (1980)
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