Póka, Viktor, and Balázs Gyenge. “Regional Impact During Covid Times on E-Grocery Industry. Investigation of Results Miskolc and Zalaegerszeg and Their Agglomeration”. Studia Mundi – Economica, vol. 9, no. 3, Sept. 2022, pp. 30-42, https://doi.org/10.18531/Studia.Mundi.2022.09.03.30-42.