@MISC{BCIALG_3.MIZ,
  AUTHOR = {Sun, Tao and Hu, Dahai and Liang, Xiquan},
  TITLE = {Several Classes of {BCK}-algebras and Their Properties},
  SECTION1 = {The Basics of General Theory of Commutative BCK-algebras},
  SECTION2 = {The Basics of General Theory of Commutative BCI-algebras},
  SECTION3 = {Bounded {BCK}-algebras},
  SECTION4 = {Implicative and Positive-Implicative {BCK}-algebras},
  DAY = {19},
  MONTH = {September},
  YEAR = {2007},
  ADDRESS1 = {Department of Mathematics and Physics\\
           Qingdao University of Science and Technology\\China},
  ADDRESS2 = {Department of Mathematics and Physics\\
           Qingdao University of Science and Technology\\China},
  ADDRESS3 = {Department of Mathematics and Physics\\
           Qingdao University of Science and Technology\\China},
  SUMMARY = {In this article the general theory of Commutative BCK-algebras 
  and BCI-algebras and several classes of {BCK}-algebras are given
  according to \cite{BCIAlgebras}.}}

@BOOK{BCIAlgebras,
       AUTHOR = {Huang, Yisheng},
        TITLE = {BCI-algebra},
    PUBLISHER = {Science Press},
         YEAR = {2006}}
