Korecki, K. ., Suchodolska, . E. ., Zarębska, B. ., Kidacki, J., & Sak, J. (2015). Application of new technologies in echocardiography as a factor objectivizing test results. Nursing in the 21st Century, 13(4(49), 67-69. https://czasopisma.umlub.pl/piel21w/article/view/2666