Uncertainty Study of Reflectance Measurements for Concentrating Solar Reflectors. - Francisco Buendía-Martínez; Aránzazu Fernández-García; Florian Sutter; Lucía Martínez-Arcos; Tomás Jesús Reche-Navarro; Alejandro García-Segura; Loreto Valenzuela (IEEE Trans. Instrum. Meas., 2020)