HAGARA, Miroslav - PÚČIK, Jozef - KULLA, Peter. Specification of Camera Parameters for Virtual Keyboard. In Radioelektronika 2013 : Proceedings of 23rd Conference Radioelektronika 2013; Pardubice, Czech republic; 16-17 April 2013. Pardubice : University of Pardubice, 2013, s.233-237. ISBN 978-1-4673-5517-9. E*117/UEF/2013