Lower and upper bounds for the continuous single facility location problem in the presence of a forbidden region and travel barrierIntesar M. Al-Mudahka, Marwa S. Al-Jeraiwi and Rym M’HallahRAIRO-Oper. Res., 55 1 (2021) 141-165DOI: https://doi.org/10.1051/ro/2020024