Efficient Implementation of the Graphical Input/Output for Smalltalk-80. - Harald Ganzinger; Georg Heeg (GI Jahrestagung (1), 1986)

Smalltalk-80. - Hubert Baumeister; Harald Ganzinger; Georg Heeg; Michael Rüger (it Inf. Technol., 1987)

Flexible Technologies to Visualize and Transform Terminological Representations Modelling Representations instead of Programming using Smalltalk. - Georg Heeg (LDV Forum, 2006)