Bonnington, P.; Hartsfield, N. and Siran, J.
Obstructions to directed embeddings of Eulerian digraphs in the plane.
European Journal of Combinatorics, 25(6) pp. 877–891.
A 2-cell embedding of an Eulerian digraph in a closed surface is said to be directed if the boundary of each face is a directed closed walk in G. We prove Kuratowski-type theorems about obstructions to directed embeddings of Eulerian digraphs in the plane.
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