1. Carcinoma of the hypopharynx—a five year follow-up;Briant;J. Otolaryngol.,1977
2. Squamous cell carcinoma of the pyriform sinus;Elbadawi;Laryngoscope,1982
3. Voice preservation in treatment of carcinoma of the pyriform sinus;Freeman;Laryngoscope,1979
4. TNM Classification of Malignant Tumours,1978
5. Clinical Examination of Voice;Hirano,1981