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Vivek Aggarwal. (2009). An In Vitro Evaluation of Effect of Ionizing Radiotherapy on Push-out Strength of Fiber Posts under Cyclic Loading. , 35(5), 0–698. doi:10.1016/j.joen.2009.01.010 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research