فهرس المقالات P. J. Allen المقاله 1 - Fuzzy Subgroups and Digraphs Induced by Fuzzy Subgroups 10.30495/tfss.2022.690699 Paul J. Allen Joseph Neggers Hee Sik Kim Transactions on Fuzzy Sets and Systems , العدد 1 , السنة 1 , بهار-تابستان 2022