@MISC{BCIALG_5.MIZ,
  AUTHOR = {Sun, Tao and Pan, Weibo and Wu, Chenglong and Liang, Xiquan},
  TITLE = {General Theory of Quasi-Commutative BCI-algebras},
  SECTION1 = {The Basics of Quasi-Commutative BCI-algebras},
  SECTION2 = {The Reduction of the Type of Quasi-Commutative BCK-algebras},
  SECTION3 = {Some Special Classes of Quasi-Commutative BCI-algebras},
  DAY = {13},
  MONTH = {May},
  YEAR = {2008},
  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 = {It is known that commutative BCK-algebras form a variety, but
  BCK-algebras do not \cite{BCIAlgebras}.
  Therefore H.~Yutani introduced the notion of
  quasi-commutative BCK-algebras. In this article we first present the
  notion and general theory of quasi-commutative BCI-algebras. Then we
  discuss the reduction of the type of quasi-commutative BCK-algebras
  and some special classes of quasi-commutative BCI-algebras.}}

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