[IEEE 2018 14th International Conference "Stability and Oscillations of Nonlinear Control Systems" (Pyatnitskiy's Conference) (STAB) - Moscow (2018.5.30-2018.6.1)] 2018 14th International Conference "Stability and Oscillations of Nonlinear Control Systems" (Pyatnitskiy's Conference) (STAB) - The limit periodic solutions of multifrequency systems described by the volterra-type integro-differential equations