Przyłuska-Fiszer, Alicja, and Agnieszka Wójcik. “Methodological Problems Connected With Scientific Research on Patients Undergoing Palliative Care”. Diametros, no. 19 (March 1, 2009): 119–131. Accessed August 3, 2021. https://diametros.uj.edu.pl/diametros/article/view/336.