M.Bernadette Ryan, Joe B. Putnam, Marion M. McMurtrey, Jack A. Roth, Irene J. Cybulsky, Louis A. Lanza,
Prognostic significance of computed tomography in resected N2 lung cancer. The Annals of Thoracic Surgery. ,vol. 54, pp. 533- 537 ,(1992) ,
10.1016/0003-4975(92)90449-E