The Tree Representation of Feasible Solutions for the TSP with Pickup and Delivery and LIFO Loading. - Dejian Tu; Songshan Guo; Hu Qin; Wee-Chong Oon; Andrew Lim 001 (AAAI, 2010)

The tree representation for the pickup and delivery traveling salesman problem with LIFO loading. - Yongquan Li; Andrew Lim 001; Wee-Chong Oon; Hu Qin; Dejian Tu (Eur. J. Oper. Res., 2011)