1. Oral acetylcysteine reduces exacerbation rate in chronic bronchitis: report of a trial organised by the Swedish Society for Pulmonary Diseases;Boman, G.; Backer, U.; Larsson, S.;EurJ Resp Dis,1983
2. Long term oral acetylcysteine in chronic bronchitis. A double blind controlled study;Group, Multicentre Study;Eur J Respir Dis
3. Theoretical statistics;Cox, D.R.; Hinkley, D.V.,1974
4. Analysis of binary data;Cox, DR,1977