From expanded digraphs to lifts of voltage digraphs and line digraphs
Dalfó, C., Fiol, M. A., Miller, M., Ryan, J.
On quotient digraphs and voltage digraphs
An algebraic approach to lifts of digraphs
Dalfó, C., Fiol, M. A., Miller, M., Ryan, J., Širáň, J.
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