@inproceedings{Blay:201320,
  author = "Blay, Pere  and  Reglero, Victor",
  title = "{X Per pulse period evolution}",
  doi = "10.22323/1.176.0026",
  booktitle = "Proceedings of  An INTEGRAL view of the high-energy sky (the first 10 years) - 9th INTEGRAL Workshop and celebration of the 10th anniversary of the launch {\textemdash} PoS(INTEGRAL 2012)",
  year = 2013,
  volume = "176",
  pages = "026"
}