Utrecht University Library offers access to two large citation databases: Web of Science and SCOPUS. If you look up an article in one of these search engines, you can see how often this article is cited in other articles ('times cited'). By clicking on this number, you will see what (more recent!) articles cite this particular article so which are about the same subject.
You can find Web of Science and SCOPUS via the homepage of the University Library under 'Search engines'. Both sources are listed in the ‘Quickly go to’-menu.
Find out more about Web of Science in our Libguide 
WOS (in dutch).
In SCOPUS you will usually find a larger number of citations than in Web of Science. This is because SCOPUS covers different, more medical subjects. SCOPUS also indexes books, book chapters, conference abstracts, letters etc. Check our LibGuide 
SCOPUS for more information about SCOPUS
Open Web of Science (make sure you open the correct tab) and choose 'Cited Reference Search'.
Enter the data of the article in question at ‘Cited Author’, ‘Cited Work’ (= journal title) and ‘Cited Year(s)’ and click on ‘Search’. Choose (if necessary) the right article from the list of results (take care to select the right volume and page numbers).
Now you will see how many times the article has been cited by others. By clicking on the number of citations you will be shown a list of articles that have cited the article in question.
Open SCOPUS. With the help of the ‘Document Search’ -option you can search for articles. Use ‘Add search fields' to search in several fields simultaneously.
To do so, search by ‘First Author’ and ‘Source Title’ and enter a date at ‘Limit to: Date range’. Choose (if necessary) the right article from the list of results (take care to select the right volume and page numbers)
Now you will see how many times the article has been cited. By clicking on the number of citations you will be shown a list of articles that have cited the article in question.