Citation: E. Lehmann et al., EFFICACY OF A SPECIAL KAVA EXTRACT (PIPER-METHYSTICUM) IN PATIENTS WITH STATES OF ANXIETY, TENSION AND EXCITEDNESS ON NONMENTAL ORIGIN - A DOUBLE-BLIND PLACEBO-CONTROLLED STUDY OF 4-WEEKS TREATMENT, Phytomedicine, 3(2), 1996, pp. 113-119