Zhelev, G. <br/><br/>
Principles and approaches to the use of video-computer technologies in the planning and management of education / 
G. Zhelev. 
 - Sofia, Bulgaria :  Paris :  Higher Institute of Mechanical andElectrical Engineering;  UNESCO,  1990. 
 - 28 p. ;  il. 
 - ED-90/CONF-401/COL-32 .
<br/><br/><label>No. de Clasificación Universal Decimal: </label>37.014.5 :681.3 (100) =20 ZHE.