When you want to find a particular article in a specific journal you can search for it via the Library's list of journals. Search for the title of the journal to see if it is available electronically or printed. If it is online follow the link to the website and find the article with the help of the information you have (title of the article, authors, page numbers, year, etc.).
in the Library for Economic Sciences are in the Journals Room. Ask at the enquiry desk for older journals.