Geodesic
Nonunique Solvability of Certain Differential Equations and Their Connection with Geometric Approximation Theory
Matematičeskie zametki, Tome 75 (2004) no. 2, pp. 287-301 Cet article a éte moissonné depuis la source Math-Net.Ru

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In this paper, we study the structural and approximative properties of sets admitting an upper semicontinuous acyclic selection from an almost-best approximation operator. We study the questions of nonunique solvability of a nonlinear inhomogeneous Dirichlet problem on the basis of these properties. 
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I. G. Tsar'kov. Nonunique Solvability of Certain Differential Equations and Their Connection with Geometric Approximation Theory. Matematičeskie zametki, Tome 75 (2004) no. 2, pp. 287-301. http://geodesic.mathdoc.fr/item/MZM_2004_75_2_a11/

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