2009

Rüthrich, K. - Zenker, R. - Buchwalder, A. - Frenkler, N.  Investigation of Electron Beam Profiling of Metal Surfaces. Proceedings of the 9th International Conference on Electron Beam Technologies, Varna: Bulgarian Academy of Sciencies, 2009, p. 152–155, ISSN 0861-4717.
Buchwalder, A. - Zenker, R.  Electron Beam Liquid Phase Surface Technologies for Component made from High Loaded Aluminium Materials. Proceedings of the 9th International Conference on Electron Beam Technologies, Varna: Bulgarian Academy of Sciencies, 2009, p. 138–141, ISSN 0861-4717.
Dalke, A. - Jung, A. - Hagymasi, L. - Buchwalder, A. - Spies, H.J. - Biermann, H.  Duplex Surface Treatment of Aluminium Alloys Using Electron Beam Surface Alloying. Proceedings of the 9th International Conference on Electron Beam Technologies, Varna: Bulgarian Academy of Sciencies, 2009, p. 128–131, ISSN 0861-4717.

2006

Zenker, R. - Buchwalder, A. - Thiemer, S. - Backofen, J.  Electron Beam Surface Countouring. Proceedings of the 8th International Conference on Electron Beam Technologies, Varna: Bulgarian Academy of Sciencies, 2006, p. 78–84.

2003

Zenker, R. - Buchwalder, A. - Spies, H.J.  New electron beam technologies for surface treatment. Proceedings of the 7th International Conference on Electron Beam Technologies, Varna: Bulgarian Academy of Sciencies, 2003, p. 202–209.