1. Lung Abscess;Brock,1952
2. Inhaled foreign bodies in children. An analysis of 40 cases;Davis;Arch. Dis. Chil.,1966
3. Tratado de Pediatría;Fanconi,1973
4. Enfermedades Respiratorias;Crofton,1971
5. Diagnóstico de las enfermedades del tórax;Fraser,1974