no. 2
Commutators of Hilbert-Schmidt type and the scattering cross section
Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 30 (1979) no. 2, pp. 89-107 
@article{AIHPA_1979__30_2_89_0,
     author = {Amrein, W. O. and Pearson, D. B.},
     title = {Commutators of {Hilbert-Schmidt} type and the scattering cross section},
     journal = {Annales de l'institut Henri Poincar\'e. Section A, Physique Th\'eorique},
     pages = {89--107},
     year = {1979},
     publisher = {Gauthier-Villars},
     volume = {30},
     number = {2},
     mrnumber = {535367},
     zbl = {0415.47005},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1979__30_2_89_0/}
}
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Amrein, W. O.; Pearson, D. B. Commutators of Hilbert-Schmidt type and the scattering cross section. Annales de l'institut Henri Poincaré. Section A, Physique Théorique, Tome 30 (1979) no. 2, pp. 89-107. https://www.numdam.org/item/AIHPA_1979__30_2_89_0/

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[2] W. Amrein and D. Pearson, A time-dependent approach to the total scattering crosssection, Journ. of Physics A (to appear). | Zbl

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