// <I>AMiTaNS' 2009<D> : 1st International conference ''Application of mathematics in technical and natural sciences'', Sozopol, Bulgaria, 22-27 june 2009. - (American institute of physics CP, 1186, 2009, p. 335+).
// <I>BalkanLight 2018<D> : Proceedings of the 7th Balkan conference on Lighting, BalkanLight 2018, Varna, Bulgaria, 20-22 september 2018, p. 26-34, Art. № 8546858, DOI: 10.1109/BalkanLight.2018.8546858.
// <I>AMEE 2019<D> : Proceedings of the 45th International conference "Applications of mathematics in engineering and economics 2019", Sozopol, 7-13 june 2019, Ser. AIP conf. proc., 2172, 2019, Art. № 070007, DOI: 10.1063/1.5133543.