7[7]Pauwels RA,Lofdahl CG,Postma DS,et al. Effect of inhaled formoterol and budesonide on exacerbations of asthma[J].New Engl J Med, 1997,337(20): 1405.
8[8]Politiek MJ,Boorsma M,Aalbers R.Comparison of formoterol,salbulamol and salmeterol in methacboline-induced severe bronchoconstriction[J].Eur Respir J, 1999,13(5):988.
9[9]Barnes P J.Anticholinergics in COPD:Theoretical implications [J].Research and Clin Forums,1991,13(2):34.
10[10]Van Cauwenberge. Advances in allergy management[J].Allergy,2002,57 ( Suppl ): 29.