Brandslund I., Lund E. D., and Sigsgaard T. “6.1.1.4 Is a Low Serum Concentration of α1-Antitrypsin Associated With an Increased Susceptibility for Byssinosis in Cotton Mill Workers? Considerations Regarding Analytical Quality Requirements and Economical Consequences”. Upsala Journal of Medical Sciences, vol. 98, no. 3, Sept. 1993, pp. 299-10, doi:10.3109/03009739309179324.