@article{chen-dr-ijsm,
          author = {Xianming Chen and Riesenfeld and Elaine Cohen},
          title = {Complexity Reduction for Symbolic Computation with Rational {B}-splines},
          journal = {International Journal of Shape Modeling},
          month = {June},
	  volume = 13,
	  number = 1,
          year = {2007},
	  pages = {25-49}
       }