1. Evaluation of biogas upgrading technologies and future perspectives: a review;Kapoor;Environ. Sci. Pollut. Control Ser.,2019
2. Global status report, REN21 secretariat, Paris, France;REN21;Tech. Rep.,2017
3. WBA Global Bioenergy Statistics 2017;Kummamuru,2016
4. Environmental decision support system for biogas upgrading to feasible fuel;Santos-Clotas;Energy,2019