Kalmár, Katalin, and László Kárpáti. “Efficiency Evaluation of Service Marketing in a Hungarian Telecommunication Company”. Applied Studies in Agribusiness and Commerce 2, no. 1-2 (October 31, 2008): 45–51. Accessed November 22, 2024. https://ojs.lib.unideb.hu/apstract/article/view/7221.