query: SELECT ?short_author ?short_authorLabel (count(?item) as ?count)
  WHERE
  {
    { ?item wdt:P921 wd:Q202864 . } UNION { ?item wdt:P921 wd:Q8071861 . }
    {?item wdt:P2093 ?short_author .} UNION {?item wdt:P50 ?short_author .}
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en" }
  }
  GROUP BY ?short_author ?short_authorLabel
  ORDER BY DESC(?count)