// <I>CMMSE' 15<D> : Proceedings of the 15th International conference on "Computational and mathematical methods in science and engineering CMMSE' 15, Costa Ballena, Rota, Cadiz , Spain, 2015, p. 671-674.
// <I>NAA' 2012<D> : 5th International conference "Numerical analysis and Its applications'' 2012, Lozenetz, Bulgaria, 15-20 june 2012. - (Lect. notes in comp. sci., Springer, 8236, 2013, p. 206-213).
// <I>NODDEA' 2012<D> : International conference "Nonlinear difference and differential equations and their applications NODDEA" , Ruse, Bulgaria, october 3-6, 2012, p. 83-92.