Nguelemo Kenfack, A., F. E. Djiofack, D. Dongo, and R. M. Etoua. “Asymptotic Behaviour of the Einstein-Yang-Mills-Higgs System in a Bianchi Type I Model”. Tamkang Journal of Mathematics, Aug. 2023, doi:10.5556/j.tkjm.55.2024.5127.