Rita, D., Ferreira, F., Meidute-Kavaliauskiene, I., Govindan, K. & Ferreira, J. (2018). Proposal of a green index for small and medium-sized enterprises: a multiple criteria group decision-making approach. Journal of Cleaner Production, 196, 985?996. https://doi.org/10.1016/j.jclepro.2018.05.275