Examination of the possibility of transborder pollution in the days with registered excee-dances of pollutant dust in the city of Ruse, BulgariaAntoaneta Stefanova, Ivanka Zheleva, Margarita Filipova and Irina TsvetkovaMATEC Web Conf., 145 (2018) 01004DOI: https://doi.org/10.1051/matecconf/201814501004