Greenaway, M. T., Kumaravadivel, P., Wengraf, J., Ponomarenko, L. A., Berdyugin, A. I., Li, J., Edgar, J. H., Kumar, R. Krishna, Geim, A. K., Eaves, L., "Graphene’s non-equilibrium fermions reveal Doppler-shifted magnetophonon resonances accompanied by Mach supersonic and Landau velocity effects", Nature Communications, 2021