Finding a Minimum-Weight k-Link Path in Graphs with the Concave Monge Property and Applications. A. Aggarwal; B. Schieber; T. Tokuyama — 1994 Discrete & computational geometry
On Minimum and Maximum Spanning Trees of Linearly Moving Points. T. Tokuyama; N. Katoh; K. Iwano — 1995 Discrete & computational geometry