Getting a list of papers cited by a given paper in google scholar

There is no direct means to only show peer-reviewed work; as Google Scholar also posts legal summaries, and other major journal articles from the Online WorldCat. However, there are means by which you can help narrow down your results, to show what you are looking for (within reason).

See this PDF:

Using Google Scholar to Find Peer-Reviewed Articles

It had been gone in redesign few months before you asked this question and most probably you had enough time to assure yourself it won't return ever.

One mitigation would be adding those keywords from topic to search query text. The other could be limiting search down to particular publishing site with site:example.com/path stem, if you know that info in advance.