Abstract
Dobreva, M; Anghelescu, H
Dobreva, M (通讯作者),Sofia Univ St Kliment Ohridski, Fac Math & Informat, 5 James Bourchier Blvd, Sofia 1164, Sofia City Prov, Bulgaria.
IFLA JOURNAL-INTERNATIONAL FEDERATION OF LIBRARY ASSOCIATIONS, 2022; 48 (1): 3