1. 1) BURGER PC. Patient age, histologic features, and the length of survival in patients with glioblastoma multiforme. Cancer. (1987) vol.59, p.1617-1625.
2. 2) Central Brain Tumor Registry of the United States : CBTRUS. (2000)
3. 3) Statistical report : Primary brain tumors in the United States. (1997)
4. 4) Committee of Brain Tumor Registry of Japan. Report of brain tumor registry of Japan (1969-1993) 10th ed.. Neurol Med-Chir. (2000) vol.40, no.Suppl,
5. 5) LEVIN VA. Phase III comparison of BCNU and the combination of procarbazine, CCNU, and vincristine administered after radiotherapy with hydroxyurea for malignant gliomas. J Neurosurg. (1985) vol.63, p.218-223.