Tip no.1
Look for peer-reviewed original research articles. Most library databases allow you limit your search to this type of publication. Need a refresher on these? Review the ENGL101/102 research guide on finding original research articles.
Tip no. 2
Reading a lot of research articles for the first time can be a little overwhelming. Here's a secret -- not many people read a scientific/technical article from start to finish -- like you would a newspaper or magazine article.
New to reading scientific articles? This research guide from the University of Portland has a lot of good sources of advice. I particularly like the quote “Nothing makes you feel stupid quite like reading a scientific journal article” from one of the sources here. Look around youtube for additional emotional and practical support.
Tip no. 3
See "who cited who" -- if you find a really relevant article, use Scopus or Google Scholar to see who has used that article in their references.