Who started at the pole position in both 1997 canadian grand prix and the 94 spanish one?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/1997_Canadian_Grand_Prix> <http://dbpedia.org/property/poleDriver> ?uri. <http://dbpedia.org/resource/1994_Spanish_Grand_Prix> <http://dbpedia.org/property/poleDriver> ?uri . }
1997_Canadian_Grand_Prix 1994_Spanish_Grand_Prix