A hybrid simulated annealing algorithm to estimate a better upper bound of the minimal total cost of a transportation problem with varying demands and suppliesZ. A. M. S. Juman, M. A. Hoque and Intesar Al-MudahkaRAIRO-Oper. Res., 57 2 (2023) 913-926DOI: https://doi.org/10.1051/ro/2022152