List few authors whose education took place in Saint Petersburg ?
SELECT DISTINCT ?uri WHERE {?uri <http://dbpedia.org/ontology/education> <http://dbpedia.org/resource/Saint_Petersburg>  . ?uri <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://dbpedia.org/ontology/Writer>}
Saint_Petersburg