TY - JOUR AU - Asadi-Lari, Mohammad-Saviz AU - Abbas-Ghorbani, Maryam AU - Tavakkoli-Mogahddam, Reza TI - A multi-objective mathematical model in an educational system with online and face-to-face learning courses during the Coronavirus pandemic JO - Journal of New Researches in Mathematics VL - 9 IS - 2 SP - 49 EP - 68 PY - 2023 DO - 10.30495/jnrm.2022.70606.2351 ER -