What has the author Egbert Hermann Renkema written?

There is no known author with the name "Egbert Hermann Renkema". It is possible that:

* The name is misspelled: There might be a slightly different spelling of the author's name.

* The author is not well-known: Perhaps the author is not widely published or has used a pseudonym.

Could you please double-check the name or provide more information about the author or their work? This would help me identify them and their writings.