Geodesic
A Gluing Theorem for the Elliptic Adjoint Operator $L^{\star}$ in the Plane
Bollettino della Unione matematica italiana, Série 9, Tome 2 (2009) no. 1, pp. 239-244.

Voir la notice de l'article provenant de la source Biblioteca Digitale Italiana di Matematica

A "matching" method for planar harmonic functions is exhibited, using an elliptic adjoint equation $L^{\star}u = 0$. 
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     title = {A {Gluing} {Theorem} for the {Elliptic} {Adjoint} {Operator} $L^{\star}$ in the {Plane}},
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Arena, Orazio. A Gluing Theorem for the Elliptic Adjoint Operator $L^{\star}$ in the Plane. Bollettino della Unione matematica italiana, Série 9, Tome 2 (2009) no. 1, pp. 239-244. http://geodesic.mathdoc.fr/item/BUMI_2009_9_2_1_a11/

[1] M. V. Safonov, Unimprovability of estimates of Hölder constants for solutions of linear elliptic equations with measurable coefficients, Matem. Sbornïk tom 132 (174) (1987), english transl. Math. USSR Sbornïk, 60, no. 1 (1988), 269-281. | fulltext EuDML | DOI | MR | Zbl