Yeung, M, Rykovanov, S, Bierbach, J, Li, L, Eckner, E, Kuschel, S, Woldegeorgis, A, Rödel, C, Sävert, A, Paulus, G G, Coughlan, M, Dromey, B & Zepf, M 2016, ' Experimental Observation of Attosecond Control over Relativistic Electron Bunches with Two-Colour Fields ' Nature Photonics, vol 11, pp. 32-35 . DOI: 10.1038/nphoton.2016.239 Yeung, M, Rykovanov, S, Bierbach, J, Li, L, Eckner, E, Kuschel, S, Woldegeorgis, A, Rödel, C, Sävert, A, Paulus, G G, Coughlan, M, Dromey, B & Zepf, M 2016, ' Experimental Observation of Attosecond Control over Relativistic Electron Bunches with Two-Colour Fields ', Nature Photonics, vol. 11, pp. 32-35 . https://doi.org/10.1038/nphoton.2016.239