Some data bases as japanes science and technologies (JST), Australian ARC, STMA-Z zentralblatt.org and many other make an ierarhy of the articles from Universities and Researches Institutions.
Other DataBase, as Scopus, use specifical evaluation of the journals and Conferences papers but the articles must have different estimated values or score. How they do that? Based only on citations is impossible, because more of the cited small level articles have not grate score.