Veleva, E., & Zheleva, I.
().
Statistical modeling of particle mater air pollutants in the city of Ruse, Bulgaria [Електронен ресурс]. // <I>NCTAM 2017<D> : 13th National congress on ''Theoretical and applied mechanics'', Sofia, Bulgaria, 6-10 september 2017 : MATEC Web of Conferences, 145, 2018, Art. № 01010, https://doi.org/10.1051/matecconf/201814501010.. (4916),