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Timothy Holmes; Rupak Das; Daniel Low; Fang-Fang Yin; James Balter; Jatinder Palta; Patricia Eifel. (2009). American Society of Radiation Oncology Recommendations for Documenting Intensity-Modulated Radiation Therapy Treatments. , 74(5), 1311–1318. doi:10.1016/j.ijrobp.2009.04.037 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research