@article{nanez2021cryptocurrency,
  title = {Cryptocurrency Mining from an Economic and Environmental Perspective. Analysis of the Most and Least Sustainable Countries}
  author = {Náñez Alonso, Sergio Luis and Jorge-Vázquez, Javier and Echarte Fernández, Miguel Ángel and Reier Forradellas, Ricardo Francisco},
  journal = {Energies},
  url = {https://www.mdpi.com/1996-1073/14/14/4254},
  year = {2021}
}