V. L. Novikov, “On almost reducible systems with almost periodic coefficients”, Mat. Zametki, 16:5 (1974), 789–799; Math. Notes, 16:5 (1974), 1065–1071
V. L. Novikov, “A certain theorem on the characteristic exponents of not almost reducible systems of linear differential equations with almost periodic coefficient matrices”, Differ. Uravn., 9:5 (1973), 857–859
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3.
V. L. Novikov, “The instability of the characteristic exponents of systems of linear differential equations with almost periodic coefficients”, Differ. Uravn., 8:5 (1972), 795–800
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