The essential spectrum of relativistic multi-particle operators
Annales de l'I.H.P. Physique théorique, Tome 67 (1997) no. 1, pp. 1-28. 
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Lewis, Roger T.; Siedentop, Heinz; Vugalter, Simeon. The essential spectrum of relativistic multi-particle operators. Annales de l'I.H.P. Physique théorique, Tome 67 (1997) no. 1, pp. 1-28. http://archive.numdam.org/item/AIHPA_1997__67_1_1_0/

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