What is the official language of Ladonia, which is the target area of Probus Journal?
SELECT DISTINCT ?uri WHERE { <http://dbpedia.org/resource/Ladonia_(micronation)> <http://dbpedia.org/ontology/officialLanguage> ?uri. <http://dbpedia.org/resource/Probus_(journal)> <http://dbpedia.org/ontology/academicDiscipline> ?uri}
Ladonia_(micronation) Probus_(journal)