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Cygan, Marek and Grandoni, Fabrizio and Leonardi, Stefano and Pilipczuk, Marcin and Sankowski, Piotr (2012) A Path-Decomposition Theorem with Applications to Pricing and Covering on Trees. In: ESA.
Cygan, Marek and Grandoni, Fabrizio and Leonardi, Stefano and Mucha, Marcin and Pilipczuk, Marcin and Sankowski, Piotr (2011) Approximation Algorithms for Union and Intersection Covering Problems. In: FSTTCS.