Ensuring sustainable development of urban public transport: A case study of the trolleybus system in Gdynia and Sopot (Poland)
2021 ◽
Vol 279
◽
pp. 123807
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2013 ◽
Vol 838-841
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pp. 2121-2126
2017 ◽
Vol 11
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2014 ◽
Vol 26
(2)
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pp. 179-184
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