On the complexity of covering nodes by K node-disjoint cycles
Portugaliae mathematica, Tome 45 (1988) no. 1, pp. 25-27.

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Keywords: cycle covering, NP-completeness, undirected graph
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     author = {Cerdeira, J. Orestes},
     title = {On the complexity of covering nodes by {K} node-disjoint cycles},
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Cerdeira, J. Orestes. On the complexity of covering nodes by K node-disjoint cycles. Portugaliae mathematica, Tome 45 (1988) no. 1, pp. 25-27. http://geodesic.mathdoc.fr/item/PORMA_1988__45_1_115605/