In reply to Steve Wilkinson.

Steve, I am already adding my own related links in or at the end of an article, but they don't only appear as ping-back between the comments of the linked article, which is wanted (even it would be more liked that they appear somehow separated from normal comments), but also in the comments widget, which is not wanted!

To prevent self-pings, I tried the method described here: https://make.wordpress.org/support/user-manual/building-your-wordpress-community/trackbacks-and-pingbacks/#can-i-stop-self-pings
but it did not work for me!