Boćkowski, Radosław, Joanna Kotowska, Aleksandra Szylińska, Agnieszka Turoń-Skrzypińska, and Iwona Rotter. 2019. “The Influence of Physical Activity on the Mood of People Subjected to Standard Rehabilitation After Cardiac Surgery”. Journal of Education, Health and Sport 9 (1):263-72. https://apcz.umk.pl/JEHS/article/view/6535.