OAVA: the open audio-visual archives aggregator. - Polychronis Charitidis; Sotirios Moschos; Chrysostomos Bakouras; Stavros Doropoulos; Giorgos Makris; Nikolas Mauropoulos; Ilias Nitsos; Sofia Zapounidou; Afrodite Malliari (Int. J. Digit. Libr., 2024)