Zheleva, I.,
Veleva, E., &
Filipova, M.
(2017).
Analysis and modeling of daily air pollutants in the city of Ruse, Bulgaria. // <I>AMiTaNS 2017<D> : 9th International conference for "Promoting the application of mathematics in technical and natural sciences", Albena, 21-26 june 2017, Ser. AIP conf. proc., 1895, 2017, Art. № 030007, DOI: 10.1063/1.5007366.. (4906),