Increasing the Resolution and Spectral Range of Measured Direct Irradiance Spectra for PV Applications. - López, Gabriel; Gueymard, Christian A.; Polo, Jesús; Alonso-Montesinos, Joaquín; Marzo, Aitor; Martín-Chivelet, Nuria; Ferrada, Pablo; Escalona-Llaguno, Martha Isabel; Batlles, Francisco Javier (Remote Sensing, 2023)