1) Spiro, R. H., Alfonso, A. E., et al.: Cervical node metastasis from epidermoid carcinoma of oral cavity and oropharynx. Am J Surg 128: 526-567 1974.
2) Schuller, D. H., McGuirt, W. F., et al.: The prognostic significance of metastatic cervical lymph nodes. Laryngoscope 90: 557-570 1980.