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Kiguradze, Ivan and Mukhigulashvili, Sulkhan (2009) On Periodic Solutions Of The System Of Two Linear Differential Equations. memoirs on differential equations and mathematical physics.
Kiguradze, Ivan and Mukhigulashvili, Sulkhan (2004) On Nonlinear Boundary Value Problems for Two-Dimensional Differential Systems. Differential Equations.