Measurements and simulations of seeded electron microbunches with collective effects oleh K. Hacker, R. Molo, S. Khan, L. L. Lazzarino, C. Lechner, Th. Maltezopoulos, T. Plath, J. Rossbach, S. Ackermann, J. Bödewadt, M. Dohlus, N. Ekanayake, T. Laarmann, H. Schlarb