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Postma DS, Kerstjens HA (November 1998). "Characteristics of airway hyperresponsiveness in asthma and chronic obstructive pulmonary disease". Am. J. Respir. Crit. Care Med. 158 (5 Pt 3): S187–92. doi:10.1164/ajrccm.158.supplement_2.13tac170. PMID9817744.
Tashkin DP, Altose MD, Connett JE, Kanner RE, Lee WW, Wise RA (June 1996). "Methacholine reactivity predicts changes in lung function over time in smokers with early chronic obstructive pulmonary disease. The Lung Health Study Research Group". Am. J. Respir. Crit. Care Med. 153 (6 Pt 1): 1802–11. doi:10.1164/ajrccm.153.6.8665038. PMID8665038.