International Precision Engineering Seminar Braunschweig, Germany, International Conference on Ultraprecision in Manufacturing Engineering, & Seyfried, P. (1991). Progress in precision engineering: Proceedings of the 6th International Precision Engineering Seminar (IPES 6) [and] 2nd International Conference on Ultraprecision in Manufacturing Engineering (UME 2), May 1991, Braunschweig, Germany. Springer-Verlag.

International Precision Engineering Seminar Braunschweig, Germany, International Conference on Ultraprecision in Manufacturing Engineering, and Peter Seyfried. Progress in Precision Engineering: Proceedings of the 6th International Precision Engineering Seminar (IPES 6) [and] 2nd International Conference on Ultraprecision in Manufacturing Engineering (UME 2), May 1991, Braunschweig, Germany. Berlin ; New York: Springer-Verlag, 1991.

International Precision Engineering Seminar Braunschweig, Germany, et al. Progress in Precision Engineering: Proceedings of the 6th International Precision Engineering Seminar (IPES 6) [and] 2nd International Conference on Ultraprecision in Manufacturing Engineering (UME 2), May 1991, Braunschweig, Germany. Springer-Verlag, 1991.