E. R. Syahputra, B. Oktaviana Sembing, A. Rafika Dewi, H. Hasdiana, and H. Maulana, “Ads Block Management System Using Open Virtual Private Network on Ubuntu Operating System”, IJET, vol. 7, no. 2.5, pp. 58–61, Mar. 2018, doi: 10.14419/ijet.v7i2.5.13951.