Ksela, J., P. Suwalski, J. M. Kalisnik, V. Avbelj, G. Suwalski, and B. Gersak. “Assessment of Nonlinear Heart Rate Dynamics After Beating-Heart Revascularization”. The Heart Surgery Forum, vol. 12, no. 1, Feb. 2009, pp. E10-E16, doi:10.1532/HSF98.20081116.