Thanks for answer, but I really want to create a VL only with no less 10 books per author. The solution that you show me, works of course, but it's not efficient for me, because I must change the sort of the list every time I need to found a specific author. For that reason I want to create a VL with a specific rule (by example, author with no less 10 books but not more than 20).
Thanks again. I hope you can help me.
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