García, Omaira, et al. “Validation of the IASI Operational CH4 and N2O Products Using Ground-Based Fourier Transform Spectrometer: Preliminary Results at the Izaña Observatory (28ºN, 17ºW)”. Annals of Geophysics, vol. 56, Jan. 2014, https://doi.org/10.4401/ag-6326.