Algorithms for Vertical and Orthogonal L1 Linear Approximation of Points. - Peter Yamamoto; Kenji Kato; Keiko Imai; Hiroshi Imai (SCG, 1988)

Minimax Geometric Fitting of Two Corresponding Sets of Points. - Keiko Imai; S. Sumino; Hiroshi Imai (SCG, 1989)

Weighted Orthogonal Linear L∞-Approximation and Applications. - Michael E. Houle; Hiroshi Imai; Keiko Imai; Jean-Marc Robert 001 (WADS, 1989)

Maximin Location of Convex Objects in a Polygon and Related Dynamic Voronoi Diagrams. - Hiromi Aonuma; Hiroshi Imai; Keiko Imai; Takeshi Tokuyama (SCG, 1990)

Probing a Set of Hyperplanes by Lines and Related Problems. - Yasukazu Aoki; Hiroshi Imai; Keiko Imai; David Rappaport (WADS, 1993)

Orthogonal Weighted Linear L1 and L∞ Approximation and Applications. - Michael E. Houle; Hiroshi Imai; Keiko Imai; Jean-Marc Robert 001; Peter Yamamoto (Discret. Appl. Math., 1993)

Enumeration of Regular Triangulations. - Tomonari Masada; Hiroshi Imai; Keiko Imai (SCG, 1996)

A Package for Triangulations. - Tsuyoshi Ono; Yoshiaki Kyoda; Tomonari Masada; Kazuyoshi Hayase; Tetsuo Shibuya; Motoki Nakade; Mary Inaba; Hiroshi Imai; Keiko Imai; David Avis (SCG, 1996)

A Branch-and-Cut Approach for Minimum Weight Triangulation. - Yoshiaki Kyoda; Keiko Imai; Fumihiko Takeuchi; Akira Tajima (ISAAC, 1997)

Voronoi Diagrams by Divergences with Additive Weights. - Kunihiko Sadakane; Hiroshi Imai; Kensuke Onishi; Mary Inaba; Fumihiko Takeuchi; Keiko Imai (SCG, 1998)

An Improved Algorithm for the Minimum Manhattan Network Problem. - Ryo Kato; Keiko Imai; Takao Asano (ISAAC, 2002)

Enumerating Triangulations in General Dimensions. - Hiroshi Imai; Tomonari Masada; Fumihiko Takeuchi; Keiko Imai (Int. J. Comput. Geom. Appl., 2002)

Map Label Placement for Points and Curves. - Takayuki Kameda; Keiko Imai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2003)

On a Geometric Structure of Pure Multi-qubit Quantum States and Its Applicability to a Numerical Computation. - Kimikazu Kato; Mayumi Oto; Keiko Imai; Hiroshi Imai (ISVD, 2006)

Label Size Maximization for Rectangular Node Labels. - Shigeki Toriumi; Hisao Endo; Keiko Imai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2006)

Error Analysis of a Numerical Calculation about One-qubit Quantum Channel Capacity. - Kimikazu Kato; Hiroshi Imai; Keiko Imai (ISVD, 2007)

Curved Voronoi Diagrams Consisting of Influence Areas with Differentiable Boundaries. - Yusuke Matsumoto; Keiko Imai; Hisashi Suzuki (ISVD, 2007)

Special Section on Discrete Mathematics and Its Applications. - Keiko Imai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2007)

Computational Geometry Analysis of Quantum State Space and Its Applications. - Kimikazu Kato; Mayumi Oto; Hiroshi Imai; Keiko Imai (Generalized Voronoi Diagram, 2008)

Guaranteed-quality anisotropic mesh generation for domains with curved boundaries. - Yusuke Yokosuka; Keiko Imai (Comput. Aided Des., 2009)

Distance k-sectors exist. - Keiko Imai; Akitoshi Kawamura; Jirí Matousek 001; Daniel Reem; Takeshi Tokuyama (SCG, 2010)

Distance k-sectors exist. - Keiko Imai; Akitoshi Kawamura; Jirí Matousek 001; Daniel Reem; Takeshi Tokuyama (Comput. Geom., 2010)

On Totally Unimodularity of Edge-Edge Adjacency Matrices. - Yusuke Matsumoto; Naoyuki Kamiyama; Keiko Imai (COCOON, 2011)

An approximation algorithm dependent on edge-coloring number for minimum maximal matching problem. - Yusuke Matsumoto; Naoyuki Kamiyama; Keiko Imai (Inf. Process. Lett., 2011)

On Total Unimodularity of Edge-Edge Adjacency Matrices. - Yusuke Matsumoto; Naoyuki Kamiyama; Keiko Imai (Algorithmica, 2013)

Minimum Point-Overlap Labeling. - Yuya Higashikawa; Keiko Imai; Yusuke Matsumoto; Noriyoshi Sukegawa; Yusuke Yokosuka (CIAC, 2017)

Polynomial Time Algorithms for Label Size Maximization on Rotating Maps. - Yusuke Yokosuka; Keiko Imai (J. Inf. Process., 2017)

Automatic Drawing of Complex Metro Maps. - Masahiro Onda; Masaki Moriguchi; Keiko Imai (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2021)

Minimum point-overlap labelling. - Yuya Higashikawa; Keiko Imai; Takeharu Shiraga; Noriyoshi Sukegawa; Yusuke Yokosuka (Optim. Methods Softw., 2021)

Extended formulations of lower-truncated transversal polymatroids. - Hiroshi Imai; Keiko Imai; Hidefumi Hiraishi (Optim. Methods Softw., 2021)