query: SELECT ?item WHERE {
  	?item wdt:P31 wd:Q5 .
          ?item wdt:P108 ?employer .
  
  VALUES ?employer {
  wd:Q13371#Harvard
  }
  
  	FILTER NOT EXISTS { ?wfr schema:about ?item . ?wfr schema:isPartOf <https://en.wikipedia.org/>.}
  	SERVICE wikibase:label {
  		bd:serviceParam wikibase:language "en,fr,de,pl" .
  	}
  }