What has the author Elvi Aer written?

There is no author known as "Elvi Aer." It's possible you've made a typo or are thinking of a different author.

Could you please double-check the name or provide more context?

For example, do you know:

* The genre of the author's work? (e.g., fantasy, science fiction, romance)

* Any specific titles or characters?

* Any other details about the author, such as their nationality or approximate time period they wrote in?

With more information, I can help you find the author you're looking for.