Name the common institution of the Erica Frank and Douglass North?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Erica_Frank> <http://dbpedia.org/ontology/institution> ?uri. <http://dbpedia.org/resource/Douglass_North> <http://dbpedia.org/ontology/institution> ?uri . }
Erica_Frank Douglass_North