Achimsky, K., Achimsky, L. and Kunertova, P. (2014) “Assessment of Interchangeability of Postal Services in Terms of Value Added”, Communications - Scientific letters of the University of Zilina, 16(2), pp. 77-82. Available at: http://journals.uniza.sk/index.php/communications/article/view/512 (Accessed: 6April2026).