I. Gupta, V. Gupta, A. Parihar, S. Gupta, R. Lüdtke, H. Safayhi, H. P. Ammon: Effects of Boswellia serrata gum resin in patients with bronchial asthma: results of a double-blind, placebo-controlled, 6-week clinical study. European Journal of Medical Research, 17.11.1998, 3. vsk, nro 11, s. 511–514. PubMed:9810030ISSN 0949-2321Artikkelin verkkoversio.
I. Gupta, V. Gupta, A. Parihar, S. Gupta, R. Lüdtke, H. Safayhi, H. P. Ammon: Effects of Boswellia serrata gum resin in patients with bronchial asthma: results of a double-blind, placebo-controlled, 6-week clinical study. European Journal of Medical Research, 17.11.1998, 3. vsk, nro 11, s. 511–514. PubMed:9810030ISSN 0949-2321Artikkelin verkkoversio.