http://eventseer.net/e/24788/253424/
abernard102's tagged items 06/26/2014
http://trainopenaccess.math.bas.bg/
http://www.emeraldinsight.com/journals.htm?WT.mc_id=journaltocalerts&articleid=17113271
abernard102's tagged items 06/25/2014
http://www.emeraldinsight.com/journals.htm?WT.mc_id=journaltocalerts&articleid=17111423
abernard102's tagged items 05/27/2014
http://dipp2014.math.bas.bg/c/document_library/get_file?groupId=38229&uuid=00bb90be-2f89-4336-bf04-870635c84e8d
abernard102's tagged items 05/24/2014
http://www.emeraldinsight.com/journals.htm?articleid=17111423&issn=0143-5124&issue=4&show=abstract&volume=35
abernard102's tagged items 05/22/2014