Question: At which point in time was educated Leonid Kantorovich who has an academic degree as a professor?
SPARQL (Wikidata): SELECT ?value1 ?value2 WHERE { wd:Q107441 p:P512 ?s . ?s ps:P512 wd:Q121594 . ?s pq:P69 ?value1 . ?s pq:P585 ?value2 }