Nesterowicz, K., S. Radicev, S.-M. Fereshtehnejad, J. Peacock, and A. Nemeslaki. “PhD Education Challenges - Doctoral Candidates’ Perspectives”. European Scientific Journal, ESJ, Vol. 15, no. 4, Feb. 2019, p. 54, doi:10.19044/esj.2019.v15n4p54.