"Daisuke Yamaguchi,Shinji Imahori,Ryuhei Miyashiro,Tomomi Matsui","An Improved Approximation Algorithm for the Traveling Tournament Problem","20th International Symposium on Algorithms and Computation (ISAAC 2009)","Algorithms and Computation  Lecture Notes in Computer Science",,"Vol. 5878",,"pp. 679-688",2009,Dec.
"Masaru Iwasa,Hiroo Saito,Tomomi Matsui","Approximation Algorithms for the Single Allocation Problem in Hub-and-Spoke Networks and Related Metric Labeling Problems",,"Discrete Applied Mathematics",,"  Vol. 157","No. Issue 9","pp. 2078--2088",2009,May
"Yusuke Kuroki,Tomomi Matsui","An Approximation Algorithm for Multidimensional Assignment Problems Minimizing the Sum of Squared Errors",,"Discrete Applied Mathematics",,"  Vol. 157","No. Issue 9","pp. 2124--2135",2009,May
"Yuichiro Miyamoto,Tomomi Matsui","Perfectness and imperfectness of unit disk graphs on triangular lattice points",,"Discrete Mathematics",,"  Vol. 309","No. Issue 9","pp. 2733-2744",2009,May
"Hirotatsu Kobayashi,Tomomi Matsui","Successful Manipulation in Stable Marriage Model with Complete Preference Lists",,"IEICE TRANSACTIONS on Information and Systems",,"  Vol. 92-D","No. 2","pp. 116-119",2009,Feb.
"Hiroo Saito,Tetsuya Fujie,Tomomi Matsui,Shiro Matuura","A study of the quadratic semi-assignment polytope",,"Discrete Optimization",,"  Vol. 61","No. 1","pp. 37-50",2009,Feb.