Google's Eric Kuan said in a Google Webmaster Help thread that to show up for Google Scholarly Articles in the search results, you absolutely do not need to markup your articles with schema or rich snippets.
Scholarly articles only show in Google when the query is scientific in nature and Google has included the article source in the Google Scholar index. Here is an example, special for the Hedy Lamarr Doodle:
Most the documents that show up in that section are from older databases of patents and other scientific databases.
Schema markup would be rare to find there.
Eric said, "the three missing elements aren't a requirement for scholarly article markup, but it is a requirement if you want to enable your page for article rich snippets."
This is probably common sense to most the readers here.
Forum discussion at Google Webmaster Help.
