@article{jesus2009catalonias,
  title = {Catalonia's energy metabolism: Using the MuSIASEM approach at different scales}
  author = {Jesús Ramos-Martín and Sílvia Cañellas-Boltà and Mario Giampietro and Gonzalo Gamboa},
  journal = {Energy Policy},
  doi = {10.1016/j.enpol.2009.06.028},
  year = {2009}
}