query: SELECT ?title ?authorstring ?author ?authorlabel ?date_time ?item WHERE { { 
    VALUES (?earliest) {("2018-01-01T00:00:00Z"^^xsd:dateTime)}
    VALUES (?latest) {("2018-12-31T00:00:00Z"^^xsd:dateTime)}
    ?item wdt:P577 ?date_time .
    hint:Prior hint:rangeSafe true .
    FILTER (?date_time >= ?earliest)
    FILTER (?date_time <= ?latest)
   { 
    ?item wdt:P2093 ?authorstring . 
    FILTER(CONTAINS(LCASE(?authorstring), "wang")) 
   }
    UNION
    {
      ?item wdt:P50 ?author. 
      ?author rdfs:label ?authorlabel .
    FILTER(CONTAINS(LCASE(?authorlabel), "wang")) 
      }
  
    ?item wdt:P1476 ?title.
    FILTER CONTAINS(LCASE(?title), "virus").
    FILTER CONTAINS(LCASE(?title), "cell").
  }
                                                                  }
  