2-upper bound graphs of posets. - Gen Kawatani; Kenjiro Ogawa; Morimasa Tsuchiya (Ars Comb., 2018)

Geometric quadrangulations of a polygon. - Atsuhiro Nakamoto; Gen Kawatani; Naoki Matsumoto; Jorge Urrutia (Electron. Notes Discret. Math., 2018)

Partially Broken Orientations of Eulerian Plane Graphs. - Gen Kawatani; Yusuke Suzuki (Graphs Comb., 2020)