Geodesic
Singular Perturbation Elliptic Boundary-Value Problems in the Case of a Nonisolated Root of the Degenerate Equation
Matematičeskie zametki, Tome 78 (2005) no. 1, pp. 26-36.

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For a singularly perturbed elliptic equation (the Neumann boundary-value problem), we prove a theorem on the passage to the limit for the case in which the degenerate equation has a nonisolated root. 
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V. F. Butuzov; M. A. Terent'ev. Singular Perturbation Elliptic Boundary-Value Problems in the Case of a Nonisolated Root of the Degenerate Equation. Matematičeskie zametki, Tome 78 (2005) no. 1, pp. 26-36. http://geodesic.mathdoc.fr/item/MZM_2005_78_1_a2/

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