@article{ana2020methodological,
  title = {Methodological framework for the implementation of circular economy in urban systems}
  author = {Ana Sánchez Levoso, Carles M. Gasol, Julia Martínez-Blanco, Xavier Gabarell Durany, Martin Lehmann, Ramon Farreny Gaya},
  journal = {Journal of Cleaner Production},
  url = {http://h2020repair.eu/wp-content/uploads/2018/03/Deliverable_3.1_Introduction_to_methodology.pdf},
  doi = {10.1016/j.jclepro.2019.119227},
  year = {2020}
}