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        Journal: Symmetry, 2018
        Volume: 10 
                	Number: 349 
                
        
        Article:
        Optimizing the High-Level Maintenance Planning Problem of the Electric Multiple Unit Train Using a Modified Particle Swarm Optimization Algorithm 
        Authors: 
       	by
                    Jianping Wu, Boliang Lin, Hui Wang, Xuhui Zhang, Zhongkai Wang and Jiaxi Wang        
        Link:
        https://www.mdpi.com/2073-8994/10/8/349
        
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