It's possible:
* He wrote but wasn't published: He might have written something but never sought publication or wasn't successful in finding a publisher.
* His writings were lost: His work, if it existed, might have been lost or destroyed over time.
* His name is misremembered or misidentified: There may be a confusion with a different author or a different name altogether.
To find more information, you would need to provide additional context:
* What is the subject matter you're interested in? Knowing the topic might help narrow down the search.
* Do you have any other information about the author? For example, do you know his profession or a specific time period he may have written in?
Without more details, it's difficult to determine if Adolf J. H. Enthoven was an author and what he might have written.