2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/137096The method of detection of the unstable periodic spatio-temporal states of spatial extended chaotic systems has been proposed. The application of this method is illustrated by the consideration of two different systems: i) the fluid model of Pierce diode being one of the fundamental system of the physics of plasmas and microwave electronics and ii) the complex one-dimensional Ginzburg-Landau equation demonstrating different regimes of spatio-temporal chaos.6 pages, 7 figuresChaotic DynamicsPattern Formation and Solitonstext