https://vocabularyserver.com/thema/en/ Thema – the subject category scheme for a global book trade EDItEUR EDItEUR 2018-10-26 en 2018-10-26 19:13:37 Decision theory: general 2018-10-26 19:13:37https://vocabularyserver.com/thema/en/xml.php?skosTema=389https://vocabularyserver.com/thema/en/xml.php?skosTema=395https://vocabularyserver.com/thema/en/xml.php?skosTema=731