@conference {Vlcek_EBT_2009,
	title = {Study of the Welding Electron Gun Optical Properties for Work Piece Imaging},
	booktitle = {Proceedings of the 9th International Conference on Electron Beam Technologies},
	year = {2009},
	pages = {70{\textendash}72},
	publisher = {Bulgarian Academy of Sciencies},
	organization = {Bulgarian Academy of Sciencies},
	address = {Varna},
	issn = {0861-4717},
	author = {Ivan Vl{\v c}ek},
	editor = {Georgy Mladenov}
}