Mitchell, J A J, Ward, M J, Kynoch, D, Santisteban, J V Hernández, Horne, K, Pott, J -U, Esser, J, Mercatoris, P, Packham, C, Ferland, G J, Lawrence, A, Fischer, T, Barth, A J, Villforth, C, Winkler, H, "The first spectroscopic IR reverberation programme on Mrk 509", Monthly Notices of the Royal Astronomical Society, 2024