Biava, N., de Gasperin, F., Bonafede, A., Edler, H., Giacintucci, S., Mazzotta, P., Brunetti, G., Botteon, A., Brüggen, M., Cassano, R., Drabent, A., Edge, A., Enßlin, T., Gastaldello, F., Riseley, C., Rossetti, M., Rottgering, H., Shimwell, T., Tasse, C., & van Weeren, R. (2021). The ultra-steep diffuse radio emission observed in the cool-core cluster RX J1720.1+2638 with LOFAR at 54 MHz. Monthly Notices of the Royal Astronomical Society, 508(3), 3995-4007. https://doi.org/10.1093/mnras/stab2840