Overriding a module stylesheet

I want to restyle a module having its own stylesheet (e.g. articles module).

Copying articles/xartemplates/includes/navtabs-user.xd to 
/themes/<mytheme>/modules/articles/includes/navtabs-user.xt, I can 
modify the template as I want.

But this template has elements styled by a stylesheet located in 
modules/articles/xarstyles/navtabs.css.

Can I have in my theme dir a new stylesheet to override navtabs.css?
If so, where do I put it?


Daniel Fournier