Split quaternions and time-like constant slope surfaces in Minkowski   3-space
  In this paper, we prove that time-like constant slope surfaces can be reparametrized by using rotation matrices corresponding to unit time-like split quaternions and homothetic motions. Afterwards we give some examples to illustrate our main results by using Mathematica. 
Murat Babaarslan and Yusuf Yayli
math-ph math.MP