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2. Second cancer following cancer of the respiratory system in Denmark, 1943-1980;Olsen;Natl. Cancer Inst. Monogr.,1985
3. Second primary respiratory tract malignant neoplasms in supraglottic carcinoma;Wagenfeld;Arch. Otolaryngol,1981
4. Multiple primary cancers in patients with initial laryngeal cancer;Kobayashi;Jpn. J. Clin. Oncol,1990
5. Multiple primary cancers in patients with head and neck cancer - incidence and additional sites;Kawamoto;Jpn. J. Cancer Clin.,1982