[whiteowl]

I have multiple books from a self-publish web site when an author used a pen name.
Then the author switched to another self-publish web site and used same pen name with a different spelling.
And now he is publishing his works under a real name.

So my question is: how to tell Callibre that these three writers are actually books by the same author? I do not want to edit book description to reassign the author, I would prefer to keep each book under the original pen name. But on Author filter (Alt+A) and adding new book I would like for Calibre to recognize known pen names and act accordingly.