Özsöyler, I., B. Lafci, B. Emrecan, M. Kestelli, S. Bozok, C. Özbek, M. Yesil, and A. Gürbüz. “Aortic Valve Replacement in True Severe Aortic Stenosis With Low Gradient and Low Ejection Fraction”. The Heart Surgery Forum, vol. 9, no. 4, June 2006, pp. E681-E685, doi:10.1532/HSF98.20061039.