Algorithms for Finding Noncrossing Steiner Forests in Plane Graphs. - Yoshiyuki Kusakari; Daisuke Masubuchi; Takao Nishizeki (ISAAC, 1999)

Finding a Noncrossing Steiner Forest in Plane Graphs Under a 2-Face Condition. - Yoshiyuki Kusakari; Daisuke Masubuchi; Takao Nishizeki (J. Comb. Optim., 2001)