i install module Book Library Books from same author to test it...
It's working "But" I modified the php file because If I selected a book
from the author 'Greg' , i've got result with greg , gregory, etc....
So I change only the select query on line 67
WHERE authors LIKE '%".$authors."%' AND b.id != " . $id .
WHERE authors LIKE '".$authors."' AND b.id != " . $id .