Geodesic
Nonstationary scattering theory for elliptic differential operators
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 14, Tome 115 (1982), pp. 285-300

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With the aid of Enss' method one constructs the scattering theory for matrical elliptic differential operators. One assumes that the perturbation coefficients decrease sufficiently fast at infinity. One allows a variable multiplicity of the eigenvalues for the symbol of the unperturbed operator. 
@article{ZNSL_1982_115_a23,
     author = {D. R. Yafaev},
     title = {Nonstationary scattering theory for elliptic differential operators},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {285--300},
     publisher = {mathdoc},
     volume = {115},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1982_115_a23/}
}
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D. R. Yafaev. Nonstationary scattering theory for elliptic differential operators. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 14, Tome 115 (1982), pp. 285-300. http://geodesic.mathdoc.fr/item/ZNSL_1982_115_a23/