End User's Joomla Artcile from a category

Hi Christopher, here's a case I would need some advice to sove it :
I have a category with one item per user (author) - Rarely two - Actually it is a kind of repository.
Twice a Year I would like to send this articles to my users so they can check it if informations are still relevant.
So each user will recieve only the article he's the author.
Any advice to do that ? Or maybe a suggestion for new tag to create ?  
Thanks in advance...

Hi Christopher, thank you for your answer
Here are my answers :

Do you have a separate mailing list for these authors, or do you need NS Pro to filter them?

Only one category (let's call it repository)

What happens if the recipient has no articles?

Why not a sentence, i.e. : "Sorry no item found" - But actually in my case, it is impossible : All members MUST have at least (and most of cases) ONE article in this category

Would it be enough to include a link to the article, or do you need its content to be included in the newsletter?

I would prefer the content, but the link can be enough if this solution is the only one available...

Regards...