What has the author Ragnar Berfenstam written?

There is no known author by the name of Ragnar Berfenstam. It is possible that you have misspelled the name or that the author is not well-known.

Could you please provide more context or information about the author, such as:

* The genre of their writing (fiction, non-fiction, poetry, etc.)

* Any specific works or titles you might know

* Any other information you might have about them

With more information, I may be able to assist you in finding the correct author or determining if the name is accurate.