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Sultan, Laith R.; Xiong, Hui; Zafar, Hanna M.; Schultz, Susan M.; Langer, Jill E.; Sehgal, Chandra M. . (2015). Vascularity Assessment of Thyroid Nodules by Quantitative Color Doppler Ultrasound. Ultrasound in Medicine & Biology, 41(5), 1287–1293. doi:10.1016/j.ultrasmedbio.2015.01.001 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research