The following publications are possibly variants of this publication:
- Minimum Certificate Dispersal with Tree StructuresTaisuke Izumi, Tomoko Izumi, Hirotaka Ono, Koichi Wada. tamc 2012: 548-559 [doi]
- Relationship between Approximability and Request Structures in the Minimum Certificate Dispersal ProblemTomoko Izumi, Taisuke Izumi, Hirotaka Ono, Koichi Wada. cocoon 2009: 56-65 [doi]
- Approximability and inapproximability of the minimum certificate dispersal problemTomoko Izumi, Taisuke Izumi, Hirotaka Ono, Koichi Wada. TCS, 411(31-33):2773-2783, 2010. [doi]
- An Approximation Algorithm for Minimum Certificate Dispersal ProblemsHua Zheng, Shingo Omura, Koichi Wada. ieicet, 89-A(2):551-558, 2006. [doi]