Aleksander KOSTADINOV; Hristo HRISTOV. A Model of Communication System with Vending Machines. Research Highlights in Science and Technology Vol. 2, [S. l.], p. 86–94, 2023. DOI: 10.9734/bpi/rhst/v2/5446E. Disponível em: https://stm.bookpi.org/RHST-V2/article/view/10609. Acesso em: 13 jun. 2026.