Which scientist advised a doctoral student named Serban Titeica?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/doctoralStudents> <http://dbpedia.org/resource/Șerban_Țițeica>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Scientist>}
Șerban_Țițeica