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Rao, S.B., Ramachandra Rao, A. The number of cut vertices and cut arcs in a strong directed graph. Acta Mathematica Academiae Scientiarum Hungaricae 22, 411–421 (1971). https://doi.org/10.1007/BF01896438
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DOI: https://doi.org/10.1007/BF01896438