Prof. Silvana Stefani is a full Professor of Mathematics Applied to Economics and Finance, Department of Statistics and Quantitative Methods, Università Milano – Bicocca, Italy. Main research activities: Discrete Mathematics applied to economics and finance: financial graphs; spectral properties of matrices and graphs, networks and centrality; Energy and environmental markets:  modelling optimal production and hedging strategies in commodity and (conventional and renewable) energy markets: mean reverting strategies in commodity markets; Environmental markets and EUA allowances; forward and futures premia. Ranking and journal classification: application of fuzzy statistical techniques to bibliometry.