E-journals offer full-text articles. If only a citation found in a database, with SFX you can see whether the item is available electronically and link directly to the full-text. Some articles, e.g. the newest ones in recent issues, may be only available in print.
When the article you are looking for is not available electronically in databases nor in print in the Oulu University Library collections:
Oula-Finna contains all Finnish and international, printed and electronic journal titles in the Oulu University Library collections but it doesn't contain information about the articles in those journals.
For databases for finding articles, see the interleafs International databases and Finnish databases.