The freeness of Ish arrangements. - Takuro Abe; Daisuke Suyama; Shuhei Tsujie (J. Comb. Theory A, 2017)

Vertex-Weighted Graphs and Freeness of ψ-Graphical Arrangements. - Daisuke Suyama; Shuhei Tsujie (Discret. Comput. Geom., 2019)

Signed graphs and the freeness of the Weyl subarrangements of type Bℓ. - Daisuke Suyama; Michele Torielli; Shuhei Tsujie (Discret. Math., 2019)