Effect of Nano-Graphene Oxide and n-Butanol Fuel Additives Blended with Diesel - Nigella sativa Biodiesel Fuel Emulsion on Diesel Engine Characteristics. - Hurmathulla Khan; Manzoore Elahi M. Soudagar; Rajagopal Harish Kumar; Mohammad Reza Safaei; Muhammad Farooq 007; Abdulqhadar Khidmatgar; Nagaraj R. Banapurmath; Rizwan A. Farade; Muhammad Mujtaba Abbas; Asif Afzal; Waqar Ahmed; Marjan Goodarzi; et al. (Symmetry, 2020)