*Timmer A, Günther J, Rücker G, Motschall E, Antes G, Kern WV. Pelargonium sidoides extract for acute respiratory tract infections. Cochrane Database of Systematic Reviews 2008, Issue 3. | *Timmer A, Günther J, Rücker G, Motschall E, Antes G, Kern WV. Pelargonium sidoides extract for acute respiratory tract infections. Cochrane Database of Systematic Reviews 2008, Issue 3. |