Holzhey, D. M., J. P. Cornely, A. J. Rastan, P. Davierwala, and F. W. Mohr. “Review of a 13-Year Single-Center Experience With Minimally Invasive Direct Coronary Artery Bypass As the Primary Surgical Treatment of Coronary Artery Disease”. The Heart Surgery Forum, vol. 15, no. 2, Apr. 2012, pp. E61-E68, doi:10.1532/HSF98.20111141.