1. Recomendaciones de la Sociedad Española de Cuidados Paliativos (SECPAL);Sanz Ortiz,1993
2. Palliation of respiratory symptoms;Ahmedzai,1998
3. Recomendaciones semFYC,1998
4. Control de los síntomas respiratorios;Méndez Vidal,2000
5. Pathophysiology and assessment of dyspnea in the patient with cancer;Dudgeon,2000