The Riccati equation method is used to establish an oscillatory and a non oscillatory criteria for nonhomogeneous linear systems of two first-order ordinary differential equations. It is shown that the obtained oscillatory criterion is a generalization of J. S. W. Wong's oscillatory criterion.
On the oscillation of linear matrix Hamiltonian systems
A non oscillation criterion for extended quasi linear Hamiltonian systems
Oscillatory and non oscillatory criteria for linear four dimensional hamiltonian systems
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