A knowledge-based toolkit for software visualisation. - Diana Sidarkeviciute; Enn Tyugu; Ago Kuusik (KBSE, 1996)

The Vertex-Exchange Graph: A New Concept for Multi-level Crossing Minimisation. - Patrick Healy; Ago Kuusik (GD, 1999)

An optimal algorithm for rectangle placement. - Patrick Healy; Marcus Creavin; Ago Kuusik (Oper. Res. Lett., 1999)

Characterization of Level Non-planar Graphs by Minimal Patterns. - Patrick Healy; Ago Kuusik; Sebastian Leipert (COCOON, 2000)

A characterization of level planar graphs. - Patrick Healy; Ago Kuusik; Sebastian Leipert (Discret. Math., 2004)

Algorithms for multi-level graph planarity testing and layout. - Patrick Healy; Ago Kuusik (Theor. Comput. Sci., 2004)