K‐ <i>ras</i> oncogene activation in lung adenocarcinomas from former smokers evidence that K‐ <i>ras</i> mutations are an early and irreversible event in the development of adenocarcinoma of the lungWilliam H. Westra, Ralph H. Hruban, Siegina G. Evers et al.|Cancer|1993Cited by 205