What is {doctoral student} of {advisor} of {Johannes Diderik van der Waals} ?
who doctoral understudy of advisor of Johannes diderik van der waals ?
who doctoral student of advisor of Johannes diderik van der waals ?
SELECT ?y WHERE { ?i property:doctoral_student ?y . resource:Johannes_Diderik_van_der_Waals property:doctoral_advisor ?i }
SELECT ?answer WHERE { ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q131721> . ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P184>. ?statement1 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?X . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> ?X. ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P185> . ?statement2 <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?answer . }
SELECT ?answer WHERE { wd:Q131721 wdt:P184 ?X . ?X wdt:P185 ?answer}
Hendrik Lorentz Johannes Diderik van der Waals Johannes Bosscha Herman Haga Louis Bleekrode Willem Jacobus Janssen