m-learning: a new stage of e-learning. - Tsvetozar Georgiev; Evgenia Georgieva; Angel Smrikarov (CompSysTech, 2004)

Multimedia training course on C++. - Evgenia Georgieva; Margarita Teodosieva; Tsvetozar Georgiev; Stoyanka Smrikarova (CompSysTech, 2004)