@article{albarran2017herrero,
  title={The Herrero-Villar approach to citation impact},
  author={Albarran, Pedro and Herrero, Carmen and Ruiz-Castillo, Javier and Villar, Antonio},
  journal={Journal of Informetrics},
  year={2017},
  volume={11},
  number={2},
  pages={625--640},
  doi={10.1016/j.joi.2016.12.003}
}