Geodesic
The defining boundary conditions and the degenerate problem for
Sbornik. Mathematics, Tome 194 (2003) no. 5, pp. 641-668 Cet article a éte moissonné depuis la source Math-Net.Ru

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For an elliptic equation with a small parameter multiplying the highest derivatives one considers a boundary-value problem such that some of the orders of the last $p$ boundary conditions are congruent modulo $2p$ (here $2p$ is the difference between the orders of the perturbed and the non-perturbed equations). In the case when no three of them are congruent modulo $2p$, associated boundary conditions are obtained and results on the asymptotic expansion are established. 
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S. A. Golopuz. The defining boundary conditions and the degenerate problem for. Sbornik. Mathematics, Tome 194 (2003) no. 5, pp. 641-668. http://geodesic.mathdoc.fr/item/SM_2003_194_5_a0/

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