@InProceedings{comprail04,
  author = "Jesus Benet and J. Montesinos and  Fernando Cuartero and Tomas  Rojo and  Enrique Arias ",
  title = "Advanced algorith to calculate mechanical forces on a catenary",
  booktitle = "In Proceedings of the 9th International Conference on Computers in Railways (COMPRAIL'04) ",
  address =  {Dresden (Germany)},
  date =    {May},
  year= " 2004"
}