...Harish Garg; Dang Ngoc Hoang Thanh; Rizk M. Rizk-Allah Purpose The paper aims to introduce a novel concept to solve the bi-level multi-criteria nonlinear fractional programming (BL-MCNFP) problems. Bi-level programming problem (BLPP) is rigorously flourished and studied by several researchers...

... considering economic benefit and covering the demand. Design/methodology/approach A bi‐level programming model which studies the facility location is established by using the methods of scenario analysis and robust optimization. It is compared with a classic location model, without considering facility...