Civelek, M., Gajdka, K., Světlík, J., & Vavrečka, V. (2020). Differences in the usage of online marketing and social media tools: evidence from Czech, Slovakian and Hungarian SMEs. Equilibrium. Quarterly Journal of Economics and Economic Policy, 15(3), 537–563. https://doi.org/10.24136/eq.2020.024