Liu Shu and Dong Shangjia, Combine Duration and "Select the Priority Trip" to Improve the Number of Boats. journal = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology. December 2012, vol. 72(12). 744 - 748 [viewed 11 May 2024]. Available from: https://publications.waset.org/pdf/14589.