Improved Approximation Algorithms for Item Pricing with Bounded Degree and Valuation. - Ryoso Hamane; Toshiya Itoh (IEICE Trans. Inf. Syst., 2008)

Approximation Preserving Reductions among Item Pricing Problems. - Ryoso Hamane; Toshiya Itoh; Kouhei Tomita (IEICE Trans. Inf. Syst., 2009)

Approximation Algorithms for the Highway Problem under the Coupon Model. - Ryoso Hamane; Toshiya Itoh; Kouhei Tomita (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2009)