“Service Sector: Rationale of Substance of Investment Potential and Methods of Its Determining”, Mediterr. J. Soc. Sci., vol. 6, no. 3 S2, p. 661, May 2015, Accessed: Nov. 21, 2024. [Online]. Available: https://www.richtmann.org/journal/index.php/mjss/article/view/6638