Istikomah, Istikomah, et al. “Primordial Helium In The Left-Right Symmetry Model With Extra Scalar Fields”. Jurnal Penelitian Fisika Dan Aplikasinya (JPFA), vol. 15, no. 1, June 2025, pp. 52-70, doi:10.26740/jpfa.v15n1.p52-70.