Question: Which German mathematicians were members of the von Braun rocket group?
SPARQL:
PREFIX dbo: <http://dbpedia.org/ontology/>
PREFIX res: <http://dbpedia.org/resource/>
SELECT DISTINCT ?uri ?abstract
WHERE {
        ?uri dbo:field res:Mathematics .
        ?uri dbo:birthPlace res:Germany .
        ?uri text:"member of" text:"von Braun rocket group" .
}