Fuzzy epsilon-subgroups. - Branka Budimirovic; Vjekoslav Budimirovic; Andreja Tepavcevic (Inf. Sci., 2010)

Fuzzy equational classes. - Branka Budimirovic; Vjekoslav Budimirovic; Branimir Seselja; Andreja Tepavcevic (FUZZ-IEEE, 2012)

Fuzzy identities with application to fuzzy semigroups. - Branka Budimirovic; Vjekoslav Budimirovic; Branimir Seselja; Andreja Tepavcevic (Inf. Sci., 2014)

E-fuzzy groups. - Branka Budimirovic; Vjekoslav Budimirovic; Branimir Seselja; Andreja Tepavcevic (Fuzzy Sets Syst., 2016)