3Meister R, Witting T, Beuscher N, et al. Efficacy and tocerability of myrtol standardized in long term treatment of chronic bronchitis[J]. Drug Re- search, 1999,49 (4): 351.
4Beuscher N, Kietzmann M, Bien E, et al. Interference of myrtol standard- ized with inflammatory and allergic mediators[J]. Arzneimittelforschung, 1998,48( 10): 985 - 989.
5Grassmann J, Hippeli S, Dornisch K, et al. Antioxidant properties of essen- tial oils. Possible explanations for their anti-inflammatory effects[J]. Arzneimittelforschung,2000,50:135 - 139.
6Matthys H, de Mey C, Cads C, et al. Efficacy and tolerability of myrtol standardized in acute bronchitis. A multi - centre, randomised, double - blind, placebo - controlled parallel group clinical trial vs. cefuroxime and ambroxol [ J ]. Arzneimittelforschung, 2000,50 (8) : 700 - 711.
7Federspil P, Wulkow R, Zimmermann T. Effects of standardized Myrtol in therapy of acute sinusitis -results of a double -blind, randomized multi- center study compared with placebo [J]. Laryngorhinootologie, 1997,76 (1):23-27.