Bleehen, N. M., Girling, D. J., Machin, D., & Stephens, R. J. (1993). A randomised trial of three or six courses of etoposide cyclophosphamide methotrexate and vincristine or six courses of etoposide and ifosfamide in small cell lung cancer (SCLC). I: Survival and prognostic factors. Medical Research Council Lung Cancer Working Party. Nature Publishing Group.

Bleehen, N. M., D. J. Girling, D. Machin, a R. J. Stephens. A Randomised Trial of Three or Six Courses of Etoposide Cyclophosphamide Methotrexate and Vincristine or Six Courses of Etoposide and Ifosfamide in Small Cell Lung Cancer (SCLC). I: Survival and Prognostic Factors. Medical Research Council Lung Cancer Working Party. Nature Publishing Group, 1993.

Bleehen, N. M., D. J. Girling, D. Machin, a R. J. Stephens. A Randomised Trial of Three or Six Courses of Etoposide Cyclophosphamide Methotrexate and Vincristine or Six Courses of Etoposide and Ifosfamide in Small Cell Lung Cancer (SCLC). I: Survival and Prognostic Factors. Medical Research Council Lung Cancer Working Party. Nature Publishing Group, 1993.