Ruseva, Y.,
Todorova, S.,
Belev, S., &
Grigorova, D.
(1998).
An Applikation of Logo! and Logo! Soft in the Education. // <I>Electronics' 98<D>: Sevanth International Scientific and Applied Science Conference, Sozopol, September 23-25, 1998; Org. by TU - Sofia, Faculty of Electronics and Elevtronic Technology: Proc.: Vol. 3.- Sofia : TU Sofia, 1998, p. 15-20..