Nonintegral criterion for oscillations of linear Hamiltonian matrix systems

In this paper we present nonintegral criteria for oscillation of linear Hamiltonian matrix system U′=A(x)U+B(x)V, V′=C(x)U−A*(x)V under the hypothesis (H): A(x), B(x)=B*(x)>0, and C(x)=C*(x) are 2×2 matrices of real valued continuous functions on the interval I=[a,∞),(−∞