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References:
[1] Ahmad S., Lazer A.C.: A new generalization of the Sturm comparison theorem to selfadjoint systems. Proc. Amer. Math. Soc. 68 (1978), 185-188. MR 0470327 | Zbl 0379.34006
[2] Borůvka O.: Linear differential transformations of the second order. The English University Press, London 1971. MR 0463539
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