%0 Journal Article %A Yuko Kuroki %A Tomomi Matsui %T Approximation Algorithm for Cycle-Star Hub Network Design Problems and Cycle-Metric Labeling Problems %J Journal of Graph Algorithms and Applications %D 2019 %P 93-110 %V 23 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.7155/jgaa.00485/ %R 10.7155/jgaa.00485 %G en %F JGAA_2019_23_1_a4