1. British National Formulary No. 27
2. Do large volume spacer devices reduce the systemic effects of high dose inhaled corticosteroids?;Brown, P.H.; Blundell, G.; Greening, A.P.; Crompton, G.K.;Thorax,1990
3. Use of spacers to facilitate inhaled corticosteroid treatment in asthma;Toogood, J.H.; Baskerville, J.; Jennings, B.; Lefcoe, N.M.; Johansson, S.A.;Am Rev Respir Dis,1984
4. Aerosol generators and delivery systems;Newman, S.P.;Respir Care,1991
5. British Thoracic Society and others. Guidelines on the management of asthma;Thorax,1993