query: embed.html#SELECT (SAMPLE(?auth_string) AS ?auth_string) (COUNT(DISTINCT ?paper) AS ?count) WHERE {
    ?paper wdt:P31 wd:Q13442814.
    ?paper p:P953 ?full_text.
    ?full_text pq:P3274 ?wrro.
    {?paper wdt:P50 ?author .} UNION {?paper wdt:P2093 ?auth_string .} 
     ?paper wdt:P953 ?wrro_url .
    SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
  }
  GROUP BY ?auth_string
  ORDER BY DESC(?count)
  LIMIT 30000