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Cheng, Mu-Hua, Guo-Hui Rao, Han-Jian Zhou, Jie-Hua Xu, and Feng Zhang. "Development of a New Semi-quantitative Non-invasive Method for Evaluating Ventricular Stroke Work." Clinical Physiology & Functional Imaging 29, no. 2 (2009): 95-99. https://doi.org/10.1111/j.1475-097X.2008.00841.x.

Cheng, Mu-Hua, et al. "Development of a New Semi-quantitative Non-invasive Method for Evaluating Ventricular Stroke Work." Clinical Physiology & Functional Imaging, vol. 29, no. 2, 2009, pp. 95-99, https://doi.org/10.1111/j.1475-097X.2008.00841.x.