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van Schayck, C P., E. Dompeling, C L. van Herwaarden, H. Folgering, A L. Verbeek, H J. van der Hoogen, and C. van Weel. Bronchodilator Treatment in Moderate Asthma or Chronic Bronchitis: Continuous or On Demand? A Randomised Controlled Study. 1991.

van Schayck, C P., et al. Bronchodilator Treatment in Moderate Asthma or Chronic Bronchitis: Continuous or On Demand? A Randomised Controlled Study. 1991.