@techreport{alvaro2013refineries,
  title = {Refineries in Spain and Portugal. Challenges and opportunities}
  author = {Álvaro Mazarrasa Alvear},
  url = {https://www.aop.es/wp-content/uploads/2019/04/el-refino-en-espana-y-portugal.pdf},
  year = {2013}
}