@article{BMMS_2009_32_3_a9,
     author = {Kyoung Ja Lee},
     title = {Bipolar {Fuzzy} {Subalgebras} and {Bipolar} {Fuzzy} {Ideals} of {BCK/BCI-Algebras}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2009},
     volume = {32},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2009_32_3_a9/}
}