ISLAND: An Interlinked Semantically-Enriched Blockchain Data Framework. - Alexandros Kalafatelis; Konstantinos Panagos; Anastasios E. Giannopoulos; Sotirios T. Spantideas; Nikolaos C. Kapsalis; Marios Touloupou; Evgenia Kapassa; Leonidas Katelaris; Panayiotis Christodoulou; Klitos Christodoulou; Panagiotis Trakadas (GECON, 2021)