The number of contractible edges in 3-connected graphs. - Katsuhiro Ota (Graphs Comb., 1988)

A sufficient condition for a bipartite graph to have a k-factor. - Hikoe Enomoto; Katsuhiro Ota; Mikio Kano (J. Graph Theory, 1988)

Longest cycles in 3-connected graphs contain three contractible edges. - Nathaniel Dean; Robert L. Hemminger; Katsuhiro Ota (J. Graph Theory, 1989)

2-factors, connectivity, and graph minors. - Nathaniel Dean; Katsuhiro Ota (Graph Structure Theory, 1991)

Regular factors in K1, n free graphs. - Yoshimi Egawa; Katsuhiro Ota (J. Graph Theory, 1991)

The 3-connected graphs having a longest cycle containing only three contractible edges. - Robert E. L. Aldred; Robert L. Hemminger; Katsuhiro Ota (J. Graph Theory, 1993)

Contractile Triples in 3-Connected Graphs. - William McCuaig; Katsuhiro Ota (J. Comb. Theory B, 1994)

Non-Contractible Edges in A 3-Connected Graph. - Yoshimi Egawa; Katsuhiro Ota; Akira Saito; Xingxing Yu (Comb., 1995)

Cycles through prescribed vertices with large degree sum. - Katsuhiro Ota (Discret. Math., 1995)

Uniform Intersecting Families with Covering Number Four. - Peter Frankl; Katsuhiro Ota; Norihide Tokushige (J. Comb. Theory A, 1995)

Note on irreducible triangulations of surfaces. - Atsuhiro Nakamoto; Katsuhiro Ota (J. Graph Theory, 1995)

Polynomial invariants of graphs II. - Seiya Negami; Katsuhiro Ota (Graphs Comb., 1996)

Connected Spanning Subgraphs of 3-Connected Planar Graphs. - Hikoe Enomoto; Tadashi Iida; Katsuhiro Ota (J. Comb. Theory, Ser. B, 1996)

Exponents of Uniform L-Systems. - Peter Frankl; Katsuhiro Ota; Norihide Tokushige (J. Comb. Theory A, 1996)

Covers in Uniform Intersecting Families and a Counterexample to a Conjecture of Lovász. - Peter Frankl; Katsuhiro Ota; Norihide Tokushige (J. Comb. Theory A, 1996)

A degree condition for the existence of regular factors in K1, n-free graphs. - Katsuhiro Ota; Taro Tokuda (J. Graph Theory, 1996)

On the Pagenumber of Complete Bipartite Graphs. - Hikoe Enomoto; Tomoki Nakamigawa; Katsuhiro Ota (J. Comb. Theory B, 1997)

Every Graph Is an Integral Distance Graph in the Plane. - Hiroshi Maehara; Katsuhiro Ota; Norihide Tokushige (J. Comb. Theory A, 1997)

Diagonal Transformations of Graphs and Dehn Twists of Surfaces. - Atsuhiro Nakamoto; Katsuhiro Ota (J. Comb. Theory B, 1997)

Diagonal Transformations in Quadrangulations and Dehn Twists Preserving Cycle Parities. - Atsuhiro Nakamoto; Katsuhiro Ota (J. Comb. Theory B, 1997)

Long cycles passing through a specified edge in a 3-connected graph. - Hikoe Enomoto; Kazuhide Hirohata; Katsuhiro Ota (J. Graph Theory, 1997)

Uniform Intersecting Families with Covering Number Restrictions. - Peter Frankl; Katsuhiro Ota; Norihide Tokushige (Comb. Probab. Comput., 1998)

Pyramidal Tours with Step-backs and the Asymmetric Traveling Salesman Problem. - Hikoe Enomoto; Yoshiaki Oda; Katsuhiro Ota (Discret. Appl. Math., 1998)

Lower Bounds for the Number of Edge-crossings Over the Spine in a Topological Book Embedding of a Graph. - Hikoe Enomoto; Miki Shimabara Miyauchi; Katsuhiro Ota (Discret. Appl. Math., 1999)

Vertex-disjoint claws in graphs. - Yoshimi Egawa; Katsuhiro Ota (Discret. Math., 1999)

Connected subgraphs with small degree sums in 3-connected planar graphs. - Hikoe Enomoto; Katsuhiro Ota (J. Graph Theory, 1999)

Graph decompositions and D3-paths with a prescribed endvertex. - Hikoe Enomoto; Shinsuke Matsunaga; Katsuhiro Ota (Discret. Math., 2000)

On Minimally (n, )-Connected Graphs. - Atsushi Kaneko; Katsuhiro Ota (J. Comb. Theory B, 2000)

Partitions of a graph into paths with prescribed endvertices and lengths. - Hikoe Enomoto; Katsuhiro Ota (J. Graph Theory, 2000)

Vertex-disjoint cycles containing specified edges in a bipartite graph. - Guantao Chen; Hikoe Enomoto; Ken-ichi Kawarabayashi; Katsuhiro Ota; Dingjun Lou; Akira Saito (Australas. J Comb., 2001)

Vertex-Disjoint Paths in Graphs. - Yoshimi Egawa; Katsuhiro Ota (Ars Comb., 2001)

Hamiltonian cycles in n-factor-critical graphs. - Ken-ichi Kawarabayashi; Katsuhiro Ota; Akira Saito (Discret. Math., 2001)

Vertex-Disjoint Stars in Graphs. - Katsuhiro Ota (Discuss. Math. Graph Theory, 2001)

Chromatic numbers of quadrangulations on closed surfaces. - Dan Archdeacon; Joan P. Hutchinson; Atsuhiro Nakamoto; Seiya Negami; Katsuhiro Ota (J. Graph Theory, 2001)

Choice number of some complete multi-partite graphs. - Hikoe Enomoto; Kyoji Ohba; Katsuhiro Ota; Junko Sakamoto (Discret. Math., 2002)

On a hamiltonian cycle in which specified vertices are not isolated. - Atsushi Kaneko; Ken-ichi Kawarabayashi; Katsuhiro Ota; Kiyoshi Yoshimoto (Discret. Math., 2002)

On separable self-complementary graphs. - Ken-ichi Kawarabayashi; Atsuhiro Nakamoto; Yoshiaki Oda; Katsuhiro Ota; Shinsei Tazawa; Mamoru Watanabe (Discret. Math., 2002)

Chromatic Numbers and Cycle Parities of Quadrangulations on Nonorientable Closed Surfaces. - Atsuhiro Nakamoto; Seiya Negami; Katsuhiro Ota (Electron. Notes Discret. Math., 2002)

On minimally 3-connected graphs on a surface. - Katsuhiro Ota (Electron. Notes Discret. Math., 2002)

The Diameters of Some Transition Graphs Constructed from Hamilton Cycles. - Mariko Hagita; Yoshiaki Oda; Katsuhiro Ota (Graphs Comb., 2002)

Path factors in cubic graphs. - Ken-ichi Kawarabayashi; Haruhide Matsuda; Yoshiaki Oda; Katsuhiro Ota (J. Graph Theory, 2002)

Hamiltonian cycles in n-extendable graphs. - Ken-ichi Kawarabayashi; Katsuhiro Ota; Akira Saito (J. Graph Theory, 2002)

Diagonal Flips in Hamiltonian Triangulations on the Sphere. - Ryuichi Mori; Atsuhiro Nakamoto; Katsuhiro Ota (Graphs Comb., 2003)

Subgraphs of graphs on surfaces with high representativity . - Ken-ichi Kawarabayashi; Atsuhiro Nakamoto; Katsuhiro Ota (J. Comb. Theory B, 2003)

2-connected 7-coverings of 3-connected graphs on surfaces. - Ken-ichi Kawarabayashi; Atsuhiro Nakamoto; Katsuhiro Ota (J. Graph Theory, 2003)

Planar triangulations which quadrangulate other surfaces. - Atsuhiro Nakamoto; Seiya Negami; Katsuhiro Ota; Jozef Sirán (Eur. J. Comb., 2004)

Vertex-disjoint cycles containing specified vertices in a bipartite graph. - Guantao Chen; Hikoe Enomoto; Ken-ichi Kawarabayashi; Katsuhiro Ota; Dingjun Lou; Akira Saito (J. Graph Theory, 2004)

A sk type condition for heavy cycles in weighted graphs. - Hikoe Enomoto; Jun Fujisawa; Katsuhiro Ota (Ars Comb., 2005)

On 3-coloring of plane triangulations. - Atsuhiro Nakamoto; Katsuhiro Ota; Mamoru Watanabe (Ars Comb., 2005)

Ore-type degree condition for heavy paths in weighted graphs. - Hikoe Enomoto; Jun Fujisawa; Katsuhiro Ota (Discret. Math., 2005)

Weighted Ramsey problem. - Jun Fujisawa; Katsuhiro Ota (Australas. J Comb., 2006)

A pair of forbidden subgraphs and perfect matchings. - Shinya Fujita 001; Ken-ichi Kawarabayashi; Cláudio Leonardo Lucchesi; Katsuhiro Ota; Michael D. Plummer; Akira Saito (J. Comb. Theory B, 2006)

Independence number and vertex-disjoint cycles. - Yoshimi Egawa; Hikoe Enomoto; Stanislav Jendrol'; Katsuhiro Ota; Ingo Schiermeyer (Discret. Math., 2007)

Chvátal Erdós condition and 2-factors with a specyfied number of components. - Guantao Chen; Ronald J. Gould; Ken-ichi Kawarabayashi; Katsuhiro Ota; Akira Saito; Ingo Schiermeyer (Discuss. Math. Graph Theory, 2007)

K1, 3-factors in graphs. - Yoshimi Egawa; Shinya Fujita 001; Katsuhiro Ota (Discret. Math., 2008)

Forbidden subgraphs and the existence of paths and cycles passing through specified vertices. - Jun Fujisawa; Katsuhiro Ota; Takeshi Sugiyama; Masao Tsugaki (Discret. Math., 2008)

3-trees with few vertices of degree 3 in circuit graphs. - Atsuhiro Nakamoto; Yoshiaki Oda; Katsuhiro Ota (Discret. Math., 2009)

Forbidden subgraphs and the existence of spanning k-trees. - Katsuhiro Ota; Takeshi Sugiyama (Discret. Math., 2010)

Spanning Trees with Bounded Total Excess. - Hikoe Enomoto; Yukichika Ohnishi; Katsuhiro Ota (Ars Comb., 2011)

Toughness of Ka,t-Minor-Free Graphs. - Guantao Chen; Yoshimi Egawa; Ken-ichi Kawarabayashi; Bojan Mohar; Katsuhiro Ota (Electron. J. Comb., 2011)

Forbidden induced subgraphs for star-free graphs. - Jun Fujisawa; Katsuhiro Ota; Kenta Ozeki; Gabriel Sueiro (Discret. Math., 2011)

N-flips in even triangulations on the torus and Dehn twists preserving monodromies. - Yusuke Higuchi; Atsuhiro Nakamoto; Katsuhiro Ota; Tadashi Sakuma (Discret. Math., 2011)

The existence of a 2-factor in K1, n-free graphs with large connectivity and large edge-connectivity. - Robert E. L. Aldred; Yoshimi Egawa; Jun Fujisawa; Katsuhiro Ota; Akira Saito (J. Graph Theory, 2011)

Forbidden triples for perfect matchings. - Katsuhiro Ota; Michael D. Plummer; Akira Saito (J. Graph Theory, 2011)

Hamiltonian cycles with all small even chords. - Guantao Chen; Katsuhiro Ota; Akira Saito; Yi Zhao 005 (Discret. Math., 2012)

Spanning trees in 3-connected K3, t-minor-free graphs. - Katsuhiro Ota; Kenta Ozeki (J. Comb. Theory B, 2012)

Maximal K3's and Hamiltonicity of 4-connected claw-free graphs. - Jun Fujisawa; Katsuhiro Ota (J. Graph Theory, 2012)

Book Embedding of Toroidal Bipartite Graphs. - Atsuhiro Nakamoto; Katsuhiro Ota; Kenta Ozeki (SIAM J. Discret. Math., 2012)

Forbidden induced subgraphs for near perfect matchings. - Katsuhiro Ota; Kenta Ozeki; Gabriel Sueiro (Discret. Math., 2013)

Forbidden Induced Subgraphs for Perfect Matchings. - Katsuhiro Ota; Gabriel Sueiro (Graphs Comb., 2013)

Forbidden Induced Subgraphs for Toughness. - Katsuhiro Ota; Gabriel Sueiro (J. Graph Theory, 2013)

Preface. - Atsuhiro Nakamoto; Katsuhiro Ota; Akira Saito (Graphs Comb., 2015)

Hadwiger's conjecture for degree sequences. - Guantao Chen; Katsuhiro Ota (J. Comb. Theory B, 2015)

Edge Proximity Conditions for Extendability in Planar Triangulations. - Jun Fujisawa; Katsuhiro Ota (J. Graph Theory, 2015)

Disjoint Chorded Cycles of the Same Length. - Guantao Chen; Ronald J. Gould; Kazuhide Hirohata; Katsuhiro Ota; Songling Shan (SIAM J. Discret. Math., 2015)

Color degree sum conditions for properly colored spanning trees in edge-colored graphs. - Mikio Kano; Shun-ichi Maezawa; Katsuhiro Ota; Masao Tsugaki; Takamasa Yashima (Discret. Math., 2020)

Preface to the special issue dedicated to Professors Eiichi Bannai and Hikoe Enomoto on their 75th birthdays. - Jack H. Koolen; Akihiro Munemasa; Atsuhiro Nakamoto; Katsuhiro Ota; Akira Saito (Graphs Comb., 2021)

Graph grabbing game on totally-weighted graphs. - Naoki Matsumoto; Ryusei Moriyama; Katsuhiro Ota (Discret. Appl. Math., 2022)

Hamiltonian cycles in 2-tough 2 K 2 $2{K}_{2}$ -free graphs. - Katsuhiro Ota; Masahiro Sanka (J. Graph Theory, 2022)

Minimum degree conditions for the existence of a sequence of cycles whose lengths differ by one or two. - Shuya Chiba; Katsuhiro Ota; Tomoki Yamashita (J. Graph Theory, 2023)

Some conditions for hamiltonian cycles in 1-tough (K2 ∪ kK1)-free graphs. - Katsuhiro Ota; Masahiro Sanka (Discret. Math., 2024)