no. 2
Norm group convergence for singular Schrödinger operators
Annales de l'I.H.P. Physique théorique, Tome 54 (1991) no. 2, pp. 179-198 
@article{AIHPA_1991__54_2_179_0,
     author = {Hughes, Rhonda J. and Kon, Mark A.},
     title = {Norm group convergence for singular {Schr\"odinger} operators},
     journal = {Annales de l'I.H.P. Physique th\'eorique},
     pages = {179--198},
     year = {1991},
     publisher = {Gauthier-Villars},
     volume = {54},
     number = {2},
     mrnumber = {1110651},
     zbl = {0780.35087},
     language = {en},
     url = {https://www.numdam.org/item/AIHPA_1991__54_2_179_0/}
}
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Hughes, Rhonda J.; Kon, Mark A. Norm group convergence for singular Schrödinger operators. Annales de l'I.H.P. Physique théorique, Tome 54 (1991) no. 2, pp. 179-198. https://www.numdam.org/item/AIHPA_1991__54_2_179_0/

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