@article{BUMI_2009_9_2_1_a11,
     author = {Arena, Orazio},
     title = {A {Gluing} {Theorem} for the {Elliptic} {Adjoint} {Operator} $L^{\star}$ in the {Plane}},
     journal = {Bollettino della Unione matematica italiana},
     pages = {239--244},
     publisher = {mathdoc},
     volume = {Ser. 9, 2},
     number = {1},
     year = {2009},
     zbl = {1176.31001},
     mrnumber = {2493653},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/BUMI_2009_9_2_1_a11/}
}