Mendes Lopes, Joao and Benitez Gimenez, Pablo and Zamora Herranz, Pablo and Miñano Dominguez, Juan Carlos (2013). 9-fold Fresnel-Köhler concentrator for increased uniform irradiance on high concentrations. In: "High and Low Concentrator Systems for Solar Electric Applications VIII - 8821-15", 25/08/2013 - 29/08/2013, San Diego, United States. pp. 1-10.