Sudheer Babu, Arumbaka, et al. “Evaluation of Complementary Effects of Exogenous Fibrolytic  Enzymes and Fumaric Acid on Methane Emission And  Ruminal Fermentation by In Vitro Method”. Indian Journal of Veterinary Sciences and Biotechnology, vol. 21, no. 6, Nov. 2025, pp. 143-7, https://doi.org/10.48165/ijvsbt.21.6.26.