Sometimes (very infrequently) a scholarly journal or researcher will retract an article, meaning that the article becomes unpublished. It happens when the article is deeply misleading, the research is discovered to be fake, or it's so badly done that the journal no longer wants to be associated with it. Sometimes databases will still store the article, but mark it "retracted." Other databases may remove it completely, so that you can't find it. Retraction Watch Database is a search engine where you can search for retractions. The results will also tell you why the article was retracted. The Retraction Watch organization website also tracks different kinds of scientific misdemeanors.
Find as many of these as you can in your popular source. Then you can enter them into an academic database and hopefully find the scholarly article it's based on. If you don't find it in one database, try another!
You'll make your search faster and more accurate if you use the dropdown menu next to the search box to tell the database which fields to search. (If you don't see the dropdown menu on the first screen, look for a link that says something like "Advanced" or "Advanced search." The advanced search function will always have it.)
For example, if I tell the General Science database to search for "stein, gertrude" only in the personal author field of the article, I'll only see articles she wrote.
Otherwise, I may also get articles written about Gertrude Stein, or even just articles that cite her in their bibliographies. If I am looking for articles she wrote, using the author field will save me from having to wade through all those extra results.