Ke Zhang 0021 Kuo-Yi Lin Jinfeng Wang 0004 Yakun Ma Huailiang Li Luyao Zhang 0006 Kehui Liu Lijie Feng UNISON framework for user requirement elicitation and classification of smart product-service system. 101996 2023 August 57 Adv. Eng. Informatics https://doi.org/10.1016/j.aei.2023.101996 db/journals/aei/aei57.html#ZhangLWMLZLF23