1. Has the change to beta-agonists combined with oral theophylline increased cases of fatal asthma ?;Wilson, J.D.; Sutherland, D.C.; Thomas, A.C.;Lancet,1981
2. Mortality from asthma: a new epidemic in New Zealand. Br MedJ';Jackson, R.T.; Beaglehole, R.; Rea, H.H.; Sutherland, D.C.,1982
3. Has the change to beta-agonists combined with oral theophylline increased cases of fatal asthma?;Grant, I.W.B.;Lancet,1981
4. British Thoracic Association. Death from asthma in two regions of
5. Br MedJ7;England,1982