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International Journal of Radiation Oncology, Biology, Physics > 2008 > 71 > 1 Supplement > S118-S121
International Journal of Radiation Oncology, Biology, Physics > 1998 > 15 > 2 > 441-447
International Journal of Radiation Oncology, Biology, Physics > 1996 > 35 > 3 > 587-592
International Journal of Radiation Oncology, Biology, Physics > 1996 > 35 > 3 > 587-592