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@article{CMH_1969__44_139387, author = {Donald Orth}, title = {Welding {Riemann} {Surfaces} and {Transmission} {Problems} with {Shifts.}}, journal = {Commentarii mathematici Helvetici}, pages = {120--137}, publisher = {mathdoc}, volume = {44}, year = {1969}, zbl = {0174.12703}, url = {http://geodesic.mathdoc.fr/item/CMH_1969__44_139387/} }
Donald Orth. Welding Riemann Surfaces and Transmission Problems with Shifts.. Commentarii mathematici Helvetici, Tome 44 (1969), pp. 120-137. http://geodesic.mathdoc.fr/item/CMH_1969__44_139387/