References
- Math. Japonica v.50 no.2 On ideals in BCK-algebras Y. Huang;Z. Chen
- J. Fuzzy Math. v.4 no.3 Fuzzy quasi-associative ideals in BCI-algebras Y. B. Jun
- J. Fuzzy Math. v.5 no.4 Fuzzy quasi-associative ideals in BCI-algebras (Ⅱ) Y. B. Jun
- Scientiae Mathematicae Japonicae Online v.6 Foldness of quasi-associative ideals BCI-algebras Y. B. Jun;S. Z. Song;C. Lele
- Selecred Papers in BCK and BCI-algebras v.1 Quasi-associative ideal of BCI-algebra Z. C. Tye;X. H. Zhang;P. R. China(ed.)