The following publications are possibly variants of this publication:
- The tree representation for the pickup and delivery traveling salesman problem with LIFO loadingYongquan Li, Andrew Lim, Wee-Chong Oon, Hu Qin, Dejian Tu. eor, 212(3):482-496, 2011. [doi]
- Knowledge-guided two-stage memetic search for the pickup and delivery traveling salesman problem with FIFO loadingYiyao Zhu, Yongquan Chen, Zhang-Hua Fu. kbs, 242:108332, 2022. [doi]