Fiducial Reference Measurements for Air Quality Monitoring Using Ground-Based MAX-DOAS Instruments (FRM4DOAS). - Michel Van Roozendael; François Hendrick; Martina M. Friedrich; Caroline Fayt; Alkis Bais; Steffen Beirle; Tim Bösch; Monica Navarro Comas; Udo Friess; Dimitris Karagkiozidis; Karin Kreher; Alexis Merlaud; et al. (Remote. Sens., 2024)