Flexible system design: A perspective from service levels. - Lifei Sheng; Huan Zheng; Ying Rong; Woonghee Tim Huh (Oper. Res. Lett., 2015)

A dynamic price-only contract: Exact and asymptotic results. - Lifei Sheng; Daniel Granot; Woonghee Tim Huh; Mahesh Nagarajan (Oper. Res. Lett., 2017)

Incentivized Actions in Freemium Games. - Lifei Sheng; Christopher Thomas Ryan; Mahesh Nagarajan; Yuan Cheng; Chunyang Tong (Manuf. Serv. Oper. Manag., 2022)

Optimal Sequencing in Single-Player Games. - Yifu Li; Christopher Thomas Ryan; Lifei Sheng (Manag. Sci., 2023)

Selling Bonus Actions in Video Games. - Lifei Sheng; Xuying Zhao; Christopher Thomas Ryan (Manag. Sci., 2025)