1. Belcher NG, Lee TH, Rees PJ (1989) Airway responses to hypertonic saline, exercise and histamine challenges in bronchial asthma. Eur Respir J 2:44?48
2. Bethel RA, Erle DJ, Epstein J, Sheppard D, Nadel JA, Boushey HA (1983) Effect of exercise rate and route of inhalation on sulfur-dioxide-induced bronchoconstriction in asthmatic subjects. Am Rev Respir Dis 128:592?596
3. Chai H, Farr SR, Froehlich LA, Mathison DS, McLean JA, Rosenthal RR, Sheffer II AL, Spector SL, Townley RG (1975) Standardization of bronchial inhalation challenge procedures. J Allergy Clin Immunol 56:323?327
4. Hartung J (1985) Statistik. 4th ed. R Oldenbourg-Verlag, München, Wien
5. Horstman D, Roger LJ, Kehrl H, Hazucha M (1986) Airway sensitivity of asthmatics to sulfur dioxide. Toxicol Environ Health 2:289?298