@article{estruch2010integrated,
  title={{An Integrated Distance for Atoms}},
  author={Estruch, V. and Ferri, C. and Hern{\'a}ndez-Orallo, J. and Ram{\'\i}rez-Quintana, M.J.},
  journal={Functional and Logic Programming},
  pages={150--164},
  year={2010},
  publisher={Springer}
}