query: SELECT DISTINCT ?item WHERE 
  {
    BIND (wd:Q160236 AS ?institution)
    ?item p:P195 [ ps:P195 ?institution ; 
                   pq:P2868 wd:Q29188408 ] .
    OPTIONAL { ?item wdt:P170 ?creator . 
    } 
    # SERVICE wikibase:label { bd:serviceParam wikibase:language "[AUTO_LANGUAGE],en". }
  }