Superiority of post-radiotherapy adjuvant chemotherapy with CCNU, procarbazine, and vincristine (PCV) over BCNU for anaplastic gliomas: NCOG 6G61 final report. - Levin,V.A.; Silver,P.; Hannigan,J.; Wara,W.M.; Gutin,P.H.; Davis,R.L.; Wilson,C.B. (Int J Radiat Oncol Biol Phys, 1990)