For citations:

Avdeev S.N., Nuralieva G.S., Batyn S.Z., Soutochnikova O.A., Chuchalin A.G. Effects of combined therapy with nebulized β₂-agonist and anticholinergics in severe exacerbation of chronic obstructive pulmonary disease. A randomized controlled trial. PULMONOLOGIYA. 2007;(3):56-65. (In Russ.) https://doi.org/10.18093/0869-0189-2007-0-3-56-65