Ullrich Zimmermann, Albin Winkelmann, Patricia, Pilhatsch, Max, Nees, Josef, Spanagel Rainer, Schulz K,
Withdrawal Phenomena and Dependence Syndrome After the Consumption of „Spice Gold“ Deutsches Aerzteblatt Online. ,vol. 106, pp. 464- 467 ,(2009) ,
10.3238/ARZTEBL.2009.0464