Keller T, Kiss HJ. How Socioeconomic Status Differences Observable in Students’ Delay of Gratification Evolved Over the Period of COVID-19-induced Online Education. Period. Polytech. Soc. Man. Sci. [Internet]. 2025 Feb. 21 [cited 2025 Jun. 27];. Available from: https://pp.bme.hu/so/article/view/21893