There is no independent list of authors for each article in Mediawiki. I consider this to be a showstopper since exporting the list of authors from history causes that:
1) also vandals and others users who added nothing into the article are listed, and
2) external authors cannot be credited in a "standard" way.
Both points are severe problems which lead to unsolvable license problems when importing stuff into Wikipedia articles and also some wikipedians refuse to improve the article because they don't want to be listed altogether with people who destroy their work.
The problem is very visible when exporting the articles from Mediawiki, for example into pdf documents.
On the other hand I feel this can be fixed relatively easily.