What has the author Marcel Leunen written?

It appears there is no widely known author named "Marcel Leunen". It's possible there's a misspelling or the name is less common.

Could you please double check the name or provide more context?

For example:

* Is there a specific book or genre you're interested in?

* Do you have any other information about the author?

* Is there a language or region associated with the author?

With more information, I might be able to help you find the author you're looking for.