Travel-time model of dual-command cycles in a 3D compact AS/RS with lower mid-point I/O dwell point policy. - Xianhao Xu; Yeming (Yale) Gong; Xiangxiang Fan; Guwen Shen; Bipan Zou (Int. J. Prod. Res., 2018)

Robotic Sorting Systems: Performance Estimation and Operating Policies Analysis. - Bipan Zou; René de Koster; Yeming Gong; Xianhao Xu; Guwen Shen (Transp. Sci., 2021)