@article{Rusin:2011,
  author  = "J. Rusin and P. Žniady and P. Žniady",
  title   = "Vibrations of double-string complex system under moving forces. Closed solutions",
  journal = "Journal of Sound and Vibration",
  volume  = "Vol. 330",
  number  = "iss. 3",
  pages   = "404--415",
  year    = "2011",
}