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@article{CMH_1974__49_139572, author = {Martin Schechter}, title = {Scattering {Theory} for {Elliptic} {Operators} of {Arbitrary} {Order}}, journal = {Commentarii mathematici Helvetici}, pages = {84--113}, publisher = {mathdoc}, volume = {49}, year = {1974}, zbl = {0288.47012}, url = {http://geodesic.mathdoc.fr/item/CMH_1974__49_139572/} }
Martin Schechter. Scattering Theory for Elliptic Operators of Arbitrary Order. Commentarii mathematici Helvetici, Tome 49 (1974), pp. 84-113. http://geodesic.mathdoc.fr/item/CMH_1974__49_139572/