Soiling Effect in a Central Receiver Solar Plant under Real Outdoor Conditions, A. Martinez, I. Bravo, R. Conceição, J. González-Aguilar, M. Romero. In EuroSun 2020 – ISES Conference Proceedings (2020), Online version, http://proceedings.ises.org/paper/eurosun2020/eurosun2020-0080-GonzalezAguilar.pdf