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Winter 1988 Comparison theorems for focal points of systems of n-th order nonselfadjoint differential equations
E.C. Tomastik
Rocky Mountain J. Math. 18(1): 1-12 (Winter 1988). DOI: 10.1216/RMJ-1988-18-1-1
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Vol.18 • No. 1 • Winter 1988
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