Steiner Minimum Trees for Equidistant Points on Two Sides of an Angle. - Rainer E. Burkard; Tibor Dudás (Acta Cybern., 1996)

Cut and patch Steiner trees for ladders. - Rainer E. Burkard; Tibor Dudás; Thomas Maier (Discret. Math., 1996)

Spanning Trees and Shortest Paths in Monge Graphs. - Tibor Dudás; Rüdiger Rudolf (Computing, 1998)