In: Digital Presentation and Preservation of Cultural and Scientific Heritage International Conference, 2013-09-18 - 2013-09-21, Veliko Tarnovo, Bulgária.
In: Digital Presentation and Preservation and Preservation of Cultural and Scientific Heritage, International Conference, Veliko Tarnovo, Bulgaria, September 18-21, 2012, Proceedings, 2012-09-18 - 2012-09-21, Veliko Trunovo, Bulgária.