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« / » https://onlinelibrary.wiley.com/doi/book/10.1002/9780470168066
« / » https://www.academia.edu/35120650/URBAN_TRANSIT_SYSTEMS_AND_TECHNOLOGY
« / » https://moodle.polymtl.ca/pluginfile.php/255428/mod_resource/content/1/civ6707_resume.pdf
« / » https://scholarcommons.usf.edu/cgi/viewcontent.cgi?article=1364&context=jpt
« / » https://globaljournals.org/GJMBR_Volume19/3-Quantitative-Assessment-of-the-Bus.pdf