What has the author H Roos written?

Please provide more context. There are many authors with the last name "Roos." To help me find the specific author you're looking for, could you please provide:

* The full name of the author (e.g., H. Roos, Heinrich Roos, Hanna Roos, etc.)

* The genre of their work (e.g., fiction, non-fiction, poetry, etc.)

* The approximate time period they wrote in (e.g., 20th century, contemporary, etc.)

* Any specific works you know of (e.g., a book title, a play, etc.)

With this information, I can help you find out what the author H Roos has written.