1. Is theophylline obsolete?;Newhouse;Chest,1990
2. Guidelines for the diagnosis and management of asthma;National Asthma Education Program Panel,1991
3. Guidelines for the management of asthma in adults: 11-acute severe asthma;British Thoracic Society;BMJ,1990
4. Aminophylline treatment in severe, acute asthma: a meta-analysis;Littengerg;JAMA,1988
5. Does aminophylline benefit adults admitted to the hospital for an acute exacerbation of asthma?;Huang;Ann Intern Med,1993