Geodesic
On the disconjugacy of a differential equation on a graph
Vladikavkazskij matematičeskij žurnal, Tome 19 (2017) no. 3, pp. 31-40 Cet article a éte moissonné depuis la source Math-Net.Ru

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The paper is devoted to the problems of disconjugacy of fourth-order differential equations on a graph. We introduce the concept of critical disconjugacy. Critical disconjugacy allows us to generalize the notion of exact interval of disconjugacy in the classical theory. We give the definition of disconjugacy in terms of the properties of a special fundamental system of solutions of an equation on a graph. This definition introduces new features into the theory, but it preserves the basic properties of the one-dimensional theory. 
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R. Ch. Kulaev. On the disconjugacy of a differential equation on a graph. Vladikavkazskij matematičeskij žurnal, Tome 19 (2017) no. 3, pp. 31-40. http://geodesic.mathdoc.fr/item/VMJ_2017_19_3_a3/

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