Wake turbulence observed behind an upstream “extra” particle in a complex (dusty) plasma S. Zhdanov, C.-R. Du, M. Schwabe, V. Nosenko, H. M. Thomas and G. E. Morfill EPL, 114 5 (2016) 55002 Published online: 01 July 2016 DOI: 10.1209/0295-5075/114/55002