The 'Orsten': more than a Cambrian Konservat-Lagerstätte yielding exceptional preservation - Maas, Andreas; Braun, Andreas; Dong, Xi-Ping; Donoghue, Philip; Muller, Klaus; Olempska, Ewa; Repetski, John; Siveter, David; Stein, Martin; Waloszek, Dieter (Palaeoworld, 2006)