The article referenced is a 1998 study that showed that Boswellia serrata gum extract at a dose of 900 mg per day divided in 3 doses for 6 weeks can reduce signs, symptoms, pulmonary function and laboratory findings associated with bronchial asthma. The study was double blinded and placebo controlled.
References:
Ref 1 Eur J Med Res. 1998 Nov 17;3(11):511-4.