@article{Veld:110823,
      author        = "Veld, Marten I. and Alastuey, Andrés and Pandolfi, Marco
                       and Amato, Fulvio and Pérez, Noemí and Reche, Cristina
                       and Via, Marta and Minguillón, María Cruz and Escudero,
                       Miguel and Querol, Xavier",
      title         = "{Compositional changes of PM2.5 in NE Spain during
                       2009–2018: a trend analysis of the chemical composition
                       and source apportionment}",
      year          = "2021",
}