What killed John Thompson Mason and Martino Martini?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/John_Thomson_Mason_(1787–1850)> <http://dbpedia.org/ontology/deathCause> ?uri. <http://dbpedia.org/resource/Martino_Martini> <http://dbpedia.org/ontology/deathCause> ?uri . }
John_Thomson_Mason_(1787–1850) Martino_Martini