Die Engineering-Sprache GRAPES. - M. Pfeiffer; Jürgen Kazmeier; Rudolf Haggenmüller; Rolf Günther (Requirements Engineering, 1991)

System engineering with DOMINO and GRAPES. - M. Pfeiffer; Rudolf Haggenmüller (Microprocess. Microprogramming, 1992)

Software- Ingenieure für Europa. - Rudolf Haggenmüller (SEUH, 1994)