Influence of petroleum and gas trade on EU economies from the reduced Google matrix analysis of UN COMTRADE dataCélestin Coquidé, Leonardo Ermann, José Lages and Dima L. ShepelyanskyEur. Phys. J. B, 92 8 (2019) 171DOI: https://doi.org/10.1140/epjb/e2019-100132-6