query: #Find common strings for authors of scientific articles
  SELECT * WHERE {
   {
   SELECT ?authorstring (COUNT(?paper) AS ?count) (GROUP_CONCAT(?paper; SEPARATOR = " , ") AS ?items) WHERE { { ?paper wdt:P2093 ?authorstring . }}
   GROUP BY ?authorstring
   }
  # FILTER(CONTAINS(LCASE(?authorstring), "-"))
   FILTER(!CONTAINS(LCASE(?authorstring), "."))
   FILTER(!regex (?authorstring, "^[A-Za-z]{1}((?= ))")).
   FILTER(!regex (?authorstring, "(?<= )[A-Za-z]{1}((?= ))")).
   FILTER(?count > 20)
  # FILTER(?count < 30)
  }
  ORDER BY DESC(?count)
  