Cost-sharing contract in a closed-loop supply chain considering carbon abatement, quality improvement effort, and pricing strategyAta Allah Taleizadeh, Seyed Taghi Akhavan Niaki and Nima Alizadeh-BasbanRAIRO-Oper. Res., 55 (2021) S2181-S2219DOI: https://doi.org/10.1051/ro/2020072