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Das, Anita and Francis, Mathew C and Mathew, Rogers and Sadagopan, N (2010) Non-contractible non-edges in 2-connected graphs. In: Information Processing Letters, 110 (23). pp. 1044-1048.
Narayanaswamy, NS and Sadagopan, N and Chandran, Sunil L (2009) On the Structure of Contractible Edges in k-connected Partial k-trees. In: Graphs and Combinatorics, 25 (4). pp. 557-569.