Referencing external documents, opposed to embedding. #38

If I want to store document references instead of embedded documents, how would I best achieve that in the repo? For example, I want to have users that can share newspapers..so something like this, where people can keep references to their favorite newspapers.

class Newspaper:Entity { string Name; string Content; Data publishDate} 
class User:Entity { string LastName; List<Newspaper>newspapers; } 

But internally that List should be serialized to store references to newspapers inside user, not content.

How seamlessly can that be accomplished and should I manually be maintaining those references through in my derived repositories?

Should those references be through ObjectIDs or strings?

Thanks for any help.

Al