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Yong-Hyun Park; Jong-Min Song; Eun-Young Lee; Yun-Jeong Kim; Duk-Hyun Kang; Jae-Kwan Song. (2008). Geometric and hemodynamic determinants of functional tricuspid regurgitation: A real-time three-dimensional echocardiography study. , 124(2), 0–165. doi:10.1016/j.ijcard.2006.12.036 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research