The following publications are possibly variants of this publication:
- An improved ant colony optimization for vehicle routing problemBin Yu, Zhong-Zhen Yang, Baozhen Yao. eor, 196(1):171-176, 2009. [doi]
- A parallel improved ant colony optimization for multi-depot vehicle routing problemB. Yu, Z. Z. Yang, J.-X. Xie. jors, 62(1):183-188, 2011. [doi]
- An Improved Ant Colony Optimization Algorithm Based on Route Optimization and Its Applications in Travelling Salesman ProblemYi Zhang, Zhi-Li Pei, Jinhui Yang, Yanchun Liang. bibe 2007: 693-698 [doi]