Wieteska, A. K., I. Majchrzyk, M. Herdynska, J. Foremny, and M. Zembala. “Nursing Risk Assessment of Postoperative Complications in Patients Aged over 75, Qualified for Cardiosurgery Operations”. International Journal of Nursing Didactics, vol. 7, no. 4, Apr. 2017, pp. 81-84, doi:10.15520/ijnd.2017.vol7.iss4.212.81-84.