@article{parameters:shemyakova:2007,
  author    = {Ekaterina Shemyakova},
  title     = {Parametric Factorizations of Second-, Third- and Fourth-Order
               Linear Partial Differential Operators with a Completely
               Factorable Symbol on the Plane},
  journal   = {Mathematics in Computer Science},
  volume    = {1},
  number    = {2},
  year      = {2007},
  pages     = {225-237},
  ee        = {http://dx.doi.org/10.1007/s11786-007-0019-1},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}