Question: Amongst the winner of Lovelace medal, who has John Robert as doctoral supervisor ?
SPARQL:
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/property/doctoralAdvisor> <http://dbpedia.org/resource/John_Robert_Woodyard> . ?uri <http://dbpedia.org/property/prizes> <http://dbpedia.org/resource/Lovelace_Medal>  . }