2009

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.

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.