Given an undirected 2-edge connected graph, finding a minimum 2-edge connected spanning subgraph is NP-hard. We solve the problem for Butterfly network, Benes network, Honeycomb network and Sierpiński gasket graph.
Citation
S. Roy, Albert William. Minimum 2-edge Connected Spanning Subgraph of Certain Graphs[J], Journal of Combinatorial Mathematics and Combinatorial Computing, Volume 092. 255-264. DOI: .