Graph Based Modeling and Implementation with EER / GRAL. - Jürgen Ebert; Andreas Winter 001; Peter Dahm; Angelika Franzke; Roger Süttenbach (ER, 1996)

Program Comprehension in Multi-Language Systems. - Bernt Kullbach; Andreas Winter 001; Peter Dahm; Jürgen Ebert (WCRE, 1998)