Braždžionytė, J., et al. “Evaluation of Intra-Aortic Balloon Counterpulsation Impact on Stroke Volume Using a Non-Invasive Technique: Impedance Cardiography”. Elektronika Ir Elektrotechnika, vol. 79, no. 7, Aug. 2007, pp. 53-58, https://doi.org/10.5755/j02.eie.10839.