@MISC{QUATERN2.MIZ,
  AUTHOR = {Ge, Fuguo},
  TITLE = {Inner Products, Group, Ring of Quaternion Numbers},
  DAY = {18},
  MONTH = {March},
  YEAR = {2008},
  ADDRESS1 = {Qingdao University of Science\\and Technology\\China},
  SUMMARY = {In this article, we define the division of the
  quaternion numbers, we also give the definition of inner products,
  group, ring of the quaternion numbers, and we prove some
  properties of them.}}

