Stability of periodic Traveling Waves for the quadratic and cubic nonlinear SchröDinger equations. - Sevdzhan Hakkaev; Iliya D. Iliev; Kiril Kirchev (Int. J. Bifurc. Chaos, 2013)

Spectral Stability for Subsonic Traveling Pulses of the Boussinesq "abc" System. - Sevdzhan Hakkaev; Milena Stanislavova; Atanas Stefanov (SIAM J. Appl. Dyn. Syst., 2013)

Convergence analysis of some iterative methods for a nonlinear matrix equation. - Vejdi I. Hasanov; Sevdzhan Hakkaev (Comput. Math. Appl., 2016)

Periodic Traveling Waves of the Regularized Short Pulse and Ostrovsky Equations: Existence and Stability. - Sevdzhan Hakkaev; Milena Stanislavova; Atanas Stefanov (SIAM J. Math. Anal., 2017)

On the Generation of Stable Kerr Frequency Combs in the Lugiato-Lefever Model of Periodic Optical Waveguides. - Sevdzhan Hakkaev; Milena Stanislavova; Atanas G. Stefanov (SIAM J. Appl. Math., 2019)

On the Stability of Periodic Waves for the Cubic Derivative NLS and the Quintic NLS. - Sevdzhan Hakkaev; Milena Stanislavova; Atanas Stefanov (J. Nonlinear Sci., 2021)

On the Stability of the Periodic Waves for the Benney System. - Sevdzhan Hakkaev; Milena Stanislavova; Atanas Stefanov (SIAM J. Appl. Dyn. Syst., 2022)