After hours puzzling I foud the next working construct having a double 
counter!
The query is different but similar.

    SELECT ?relation (COUNT(?relation) AS ?count)
    WHERE { 
            ?author ?relation ex:Paper1 .
            }
            GROUP BY ?relation
            HAVING (COUNT(?relation) < 2 )

Jörn, thank you for the social motivation :)

Richard


On Monday, February 25, 2019 at 9:44:36 PM UTC+1, Richard Dijkstra wrote:
>
> Dear rdflib user/devleoper,
>
> I am enthousiatic about rdflib but I am shocked that only few questions 
> are asked here and even less are answered. I did expect a lot more.
>
> Does anybody have a idea why this is the case.
> Thank you for your reply.
>
> Richard D
>

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