Xavier, F., L. de A. Henn, O. Marja, and L. Orlandine. “Smoking and Its Relation to the Histological Type, Survival, and Prognosis Among Patients With Primary Lung Cancer”. São Paulo Medical Journal, vol. 114, no. 6, Nov. 1996, pp. 1298-02, https://periodicosapm.emnuvens.com.br/spmj/article/view/2053.