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

Forbidden subgraphs and 2-factors in 3/2-tough graphs. - Masahiro Sanka (J. Graph Theory, 2023)

An Ore-Type Condition for Hamiltonicity in Tough Graphs and the Extremal Examples. - Masahiro Sanka; Songling Shan (Electron. J. Comb., 2024)

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