@article{Matkowski:1997,
  author  = "J. Matkowski and Z. Weinian",
  title   = "Method of characteristic for functional equations in polynominal form",
  journal = "Acta Mathematica Sinica, New Series",
  volume  = "Vol. 13",
  number  = "no 3",
  pages   = "421--432",
  year    = "1997",
}