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APA Citation
Qiao, S., Tao, X., Ma, R., Xu, X., & Chen, H. H. (2016). a conceptual model to minimise operational cost for free shuttle buses: a case study in Macau. International journal of heavy vehicle systems, 23, 40–59. http://access.bl.uk/ark:/81055/vdc_100069335042.0x000009