Łukasz, Rymaniak, Fuć Paweł, Lijewski Piotr, Kamińska Michalina, Daszkiewicz Paweł, and Ziółkowski Andrzej. 2019. “Evaluating the Environmental Costs in Poland of City Buses Meeting the Euro VI Norm Based on Tests in Real Operating Conditions”. Archives of Transport 52 (4): 109-15. https://doi.org/10.5604/01.3001.0014.0212.