TUAN, D. V.; KHOI, T. M.; AN, V.; HIEN, N. T. T.; CHI, H. M.; MINH, T. Q.; THUONG, L. V.; NHAN, N. V. Study, design, installation and operating procedures for buses using LPG/diesel fuel. Petrovietnam Journal, v. 12, p. 44-49, 31 Dec. 2014.