&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ACM Transactions on Information Systems. 2000.<br><br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;т. 18 вып. 3: Vol. 18 No. 3. &mdash; 2000. &mdash; ISSN 1046-8188.<br><br><br><br>[ SYS NUM: 9034 ]