References
- D. Dubois and H. Prade, Fuzzy sets and systems: Theory and Applications, Academic Press, 1980.
- H. Harizavi, Prime weak hyper BCK-ideals of lower hyper BCK-semilattice, Sci. Math. Jpn. 68 (2008), no. 3, 353-360.
- Y. B. Jun and W. H. Shim, Fuzzy implicative hyper BCK-ideals of hyper BCK-algebras, Internat. J. Math. Math. Sci. 29 (2002), no. 2, 63-70. https://doi.org/10.1155/S016117120201195X
- Y. B. Jun and X. L. Xin, Scalar elements and hyperatoms of hyper BCK-algebras, Scientiae Mathematicae 2 (1999), no. 3, 303-309.
- Y. B. Jun and X. L. Xin, Fuzzy hyper BCK-ideals of hyper BCK-algebras, Sci. Math. Jpn. 53 (2) (2001), 353-360.
- Y. B. Jun, X. L. Xin, E. H. Roh and M. M. Zahedi, Strong hyper BCK-ideals of hyper BCK-algebras, Math. Japonica 51 (3) (2000), 493-498.
- Y. B. Jun, M. M. Zahedi, X. L. Xin and R. A. Borzooei, On hyper BCK-algebras, Italian J. of Pure and Appl. Math. 8 (2000), 127-136.
- F. Marty, Sur une generalization de la notion de groupe, 8th Congress Math. Scandinaves, Stockholm (1934), 45-49.
- L. A. Zadeh, Fuzzy sets, Information and Control 8 (1965), 338-353. https://doi.org/10.1016/S0019-9958(65)90241-X
- H. -J. Zimmermann, Fuzzy Set Theory and its Applications, Kluwer-Nijhoff Publishing, 1985.