// <I>ICTRS' 2012<D> : First International conference on "Telecommunication and remote sensing", Sofia, Bulgaria, 29-30 august 2012 : Proc., 2012, p. 170-174.
// <I>Summer school<D> : Advanced aspects of theoretical electrical engineering, Sozopol, 19-22 september 2014, Sozopol, Bulgaria : Proc. : Plenary lectures. - P. I . - Sofia : TU, 2014, p. 76-79.
// <I>CMMSE' 14<D> : Proceedings of the 14th International conference on "Computational and mathematical methods in science and engineering CMMSE' 14, Costa Ballena, Rota, Cadiz , Spain, 2014, p. 777-780.