Variational Design in Electrical Engineering - An Extension of Parametric Modeling. - Dieter Roller 002; Dirk Schäfer 002 (CAD Tools and Algorithms for Product Design, 1998)

Representation and Conversion of Dimension Units in CAD Data Models. - Dieter Roller 002; Oliver Eck; B. Rieg; Dirk Schäfer 002 (Knowledge Intensive CAD, 2000)

Variantentechnologie unter besonderer Berücksichtigung von Elektrotechnik-CAD. - Dirk Schäfer 002 (Shaker, 2003)