Need to find scientific studies

[StreetwiseReports]

I need to find scientific studies that back up a claim. I am searching the internet and see a mix of studies with blog posts with other stuff. Is there a way to isolate scientific studies in a search result?

[CMC-SD]

http://scholar.google.com/

[StreetwiseReports]

Thanks, I know about this, but the results show everything, including blog posts. What I want is a verified study that shows results