query: SELECT ?title ?authorstring ?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"))
  
    ?item wdt:P1476 ?title.
    FILTER CONTAINS(LCASE(?title), "dna").
    FILTER CONTAINS(LCASE(?title), "aptamer").
  }}
  