When did Carl Friedrich Gauss receive his doctoral thesis from University of Helmstedt?
SELECT ?value1 ?value2 WHERE { wd:Q6722 p:P69 ?s . ?s ps:P69 wd:Q314466 . ?s pq:P585 ?value1 . ?s pq:P1026 ?value2 }
carl friedrich gauss: Q6722 university of helmstedt: Q314466