| Axel Brattström A newly developed extract (Ze 339) from butterbur (Petasites hybridus L.) is clinically efficient in allergic rhinitis (hay fever)Axel Brattström Max Zeller Sohne AG, Romanshorn, Switzerland Phytomedicine 10:50-2. 2003 Efficacy and safety of butterbur herbal extract Ze 339 in seasonal allergic rhinitis: postmarketing surveillance studyRobert Käufeler Max Zeller Sohne AG, Romanshorn, Switzerland Adv Ther 23:373-84. 2006 Scientific evidence for a fixed extract combination (Ze 91019) from valerian and hops traditionally used as a sleep-inducing aidAxel Brattström Max Zeller Sohne AG, Romanshorn, Switzerland Wien Med Wochenschr 157:367-70. 2007
| - Robert Käufeler
- Uwe Koetter
- Wolgang Polasek
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