S. Negami and Y. Ohno, Correlation among triad colorings of triangulations on closed surfaces, to appear in Yokohama Mathematical Journal.
K. Enami and Y. Ohno, Difference of facial achromatic numbers between two triangular embeddings of a graph, Theory and Applications of Graphs, Vol.10 (2023) Iss.2, Article6.
M. Furuya, N. Matsumoto, Y. Ohno and K. Ozeki, Note on fair game edge-connectivity of graphs, Discrete Applied Mathematics 333 (2023), p. 132-135.
N. Haghparast, M. Hasanvand and Y. Ohno, The existence of uniform hypergraphs for which interpolation property of complete colorings fails, Discrete Mathematics 345 (2022), #112722.
N. Matsumoto and Y. Ohno, Facial achromatic number of triangulations with given guarding number, Theory and Applications of Graphs, Vol.9 (2022) Iss.1, Article1.
N. Matsumoto and Y. Ohno, Achromatic number and facial achromatic number of connected locally-connected graphs, Discrete Applied Mathematics 302 (2021), p.34-41.
N. Matsumoto and Y. Ohno, Facial achromatic number of triangulations on the sphere, Discrete Mathematics 343 (2020), #111651.
S. Negami and Y. Ohno, Triad colorings of triangulations on closed surfaces, Journal of Nonlinear and Convex Analysis 19 (2018), p.1775-1780.