Hiroshi Imai, Keiko Imai, Hidefumi Hiraishi. Extended formulations of lower-truncated transversal polymatroids. Optimization Methods and Software. 2020
Masahiro Onda, Masaki Moriguchi, Keiko Imai. Automatic Drawing for Tokyo Metro Map. Proceedings of the European Workshop on Computational Geometry. 2018
Yusuke Yokosuka, Keikoi Imai. Polynomial time algorithms for label size maximization on rotating maps. Journal of Information Processing. 2017. 25. 572-579