Nesterowicz, Krzysztof, Slobodan Radicev, Seyed-Mohammad Fereshtehnejad, John Peacock, and András Nemeslaki. “PhD Education Challenges - Doctoral Candidates’ Perspectives”. European Scientific Journal, ESJ 15, no. 4 (February 28, 2019): 54. Accessed April 27, 2024. https://eujournal.org/index.php/esj/article/view/11756.