UPIRTHI VIJITHA; A SOMASEKAR. Design and Performance of Automatic Vending Machine using VHDL. International Journal of Computer Engineering in Research Trends, [S. l.], v. 1, n. 6, p. 485–493, 2014. Disponível em: https://www.ijcert.org/index.php/ijcert/article/view/111. Acesso em: 30 may. 2026.