Conceptual matrix for the biofuels of the future applicable to the Romanian economy Gheorghe Lăzăroiu, Lucian Mihăescu, Gabriel Negreanu, Viorel Berbece, Elena-Adriana Jarcu and Laura Alexandra Stănescu E3S Web Conf., 112 (2019) 02002 Published online: 20 August 2019 DOI: 10.1051/e3sconf/201911202002