@article{Infeld:2018,
  author  = "E. Infeld and A. Karczewska and G. Rowlands and P. Rozmej",
  title   = "Exact Cnoidal Solutions of the Extended KdV Equation",
  journal = "Acta Physica Polonica A",
  volume  = "Vol. 133",
  number  = "no. 5",
  pages   = "1191--1199",
  year    = "2018",
}