Vacuum energy in non-supersymmetric quasi-realistic heterotic-string vacua with fixed moduliEman Basaad, Luke A. Detraux, Alonzo R. Diaz Avalos, Alon E. Faraggi and Benjamin PercivalEur. Phys. J. C, 85 2 (2025) 209DOI: https://doi.org/10.1140/epjc/s10052-024-13733-2