Nekhanevich, O. B., and M. A. Kuznetsova. 2014. “Usage of Echocardiography With Physical Loads for Diagnosis of Myocardial Contractile Reserve of the Left Ventricle in Athletes”. Medicni Perspektivi 19 (3):75-81. https://doi.org/10.26641/2307-0404.2014.3.30406.