Finally, following the advices given by the fine patrons of this sub-forum, I got what I wanted, see the authors listed as <LN, FN> and sorted by LN.
In case somebody else wants to do the same, this was my procedure:
1. Using the free Bulk Rename Utility (just google it), I renamed the file to "title - lastname, firstname.epub"
2. Open Calibre.
3. In menu "Preferences->Tweak->Author sort name algorithm" I put author_sort_copy_method = 'copy'
4. In menu "Preferences->Adding books" I unchecked all three options and I left the default regular expression alone.
5. Close and open Calibre.
6. Add the books to Calibre library and voila!
Thanks to all
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