1. Farmacología Humana, Sección VI;Flores,1998
2. Olaguibel., Inhibidores de las defosfodiesterasas. http://www.alergoaragon.org/2003/tercera.html.
3. Low-dose theophylline: a new anti-inflammatory role in asthma management?;MacLeod;Monald. Arch. Chest. Dis.,1996
4. Theophylline in chronic asthma – evidence for disease-modifying properties;Chung;Clin. Exp. Allergy,1996
5. Pharmacologic modulation of inflammatory mediator release by rat mast;Sullivan;Am. J. Pathol.,1976