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2. Is curable lung cancer detected by semiannual screening?;Boucot;J.A.M.A,1973
3. Earlier diagnosis and survival in lung cancer;Brett;Brit. Med. J,1969
4. The roentgenographic appearance of large cell carcinoma of the bronchus;Byrd;Mayo Clin. Proc,1968
5. The roentgenographic appearance of small cell carcinoma of the bronchus;Byrd;Mayo Clin. Proc,1968