Müller, C., Di Piazza, A., Shahbaz, A., Bürvenich, T. J., Evers, J., Hatsagortsyan, K. Z., et al. (2008). High-energy, nuclear and QED processes in strong laser fields. Laser Physics, 18(3), 175-184. doi:10.1007/s11490-008-3001-y.