Yordanova, Mariana Zhivkova. “Professional Competences of the Radiographer: A Challenge for the Healthcare System in Bulgaria”. Journal of Advance Research in Social Science and Humanities (ISSN 2208-2387), vol. 4, no. 9, Sept. 2018, pp. 08-14, https://doi.org/10.53555/nnssh.v4i9.281.