author = { Huppertz, Bernd AND Gauchel, Gisela AND Feiertag, Heribert AND Schweizer, Hermann AND Krieger, Horst AND Richter, Francois AND Heinz, Helmut AND Blanke, Joerg AND Gastpar, Markus AND Keller, Ruprecht },

title = { Urine labeling with orally applied marker substances in drug substitution therapy },

publisher = {Walter de Gruyter GmbH},

isbn = {1434-6621},

isbn = {1437-4331},

keywords = { Biochemistry (medical) , Clinical Biochemistry , General Medicine },

year = {2004},