oh!! I didnt see your response
the fact is that I need to display that information. We have been thinking about the issue and we understand why the duplication happens. So we have been thinking that maybe by changing the php code of the view we could get a resultset (out of the view loop) and then filter it with the view. Would it be posible?
It seem that this would require a custom solution since you want to display the publication authors based on the posts and multiple posts have the same parent.
A custom shortcode should be able to get this done for you since you have more flexibility with the data manipulation.
However i'm not able to assist you with this custom code as it is out of the scope of our forum support.