What has the author Helfred Erwin Sartori written?

There is no known author named Helfred Erwin Sartori. It is possible that the name is misspelled or that the author has a different pen name.

To help me find the correct author, could you please provide:

* Any other information about the author: Do you know their nationality, era, genre they write in, or any other details?

* The title of a book or work they wrote: Even a partial title or a description of the content could be helpful.

With more information, I can try to identify the author you are looking for.