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- [6] Singular Perturbations of Elliptic Operators COMPLEX ANALYSIS AND DYNAMICAL SYSTEMS VI, PT 1: PDE, DIFFERENTIAL GEOMETRY, RADON TRANSFORM, 2015, 653 : 117 - 136
- [8] On a factorization of second-order elliptic operators and applications JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, 2006, 39 (40): : 12407 - 12425