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The purpose of this paper is to obtain oscillation criteria for the differential system $$\begin{array}{cc}\hfill {[y_1\left(t\right)-a\left(t\right)y_1\left(g\left(t\right)\right)]}^{\text{'}}& =p_1\left(t\right)f_1\left(y_2\left(h_2\left(t\right)\right)\right)\hfill \\ \hfill y_2^{\text{'}}\left(t\right)& =p_2\left(t\right)f_2\left(y_3\left(h_3\left(t\right)\right)\right)\hfill \\ \hfill y_3^{\text{'}}\left(t\right)& =-p_3\left(t\right)f_3\left(y_1\left(h_1\left(t\right)\right)\right),t\in {ℝ}_{+}=[0,\infty ).\hfill \end{array}$$

We study oscillatory properties of solutions of systems $$\begin{array}{ccc}\hfill {[y_1\left(t\right)-a\left(t\right)y_1\left(g\left(t\right)\right)]}^{\text{'}}=& p_1\left(t\right)y_2\left(t\right),y_2^{\text{'}}\left(t\right)=\hfill & \hfill -p_2\left(t\right)f\left(y_1\left(h\left(t\right)\right)\right),t\ge t_0.\end{array}$$

We study oscillatory properties of solutions of the systems of differential equations of neutral type.

The purpose of this paper is to obtain oscillation criterions for the differential system of neutral type.