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@article{CMH_1982__57_139898, author = {E. Trubowitz and B.E.J. Dahlberg}, title = {A remark on two dimensional periodic potentials.}, journal = {Commentarii mathematici Helvetici}, pages = {130--134}, publisher = {mathdoc}, volume = {57}, year = {1982}, zbl = {0539.35059}, url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139898/} }
E. Trubowitz; B.E.J. Dahlberg. A remark on two dimensional periodic potentials.. Commentarii mathematici Helvetici, Tome 57 (1982), pp. 130-134. http://geodesic.mathdoc.fr/item/CMH_1982__57_139898/