no. 1
A trace formula for reductive groups. II : applications of a truncation operator
Compositio Mathematica, Tome 40 (1980) no. 1, pp. 87-121 
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     author = {Arthur, James},
     title = {A trace formula for reductive groups. {II} : applications of a truncation operator},
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     pages = {87--121},
     year = {1980},
     publisher = {Sijthoff et Noordhoff International Publishers},
     volume = {40},
     number = {1},
     mrnumber = {558260},
     zbl = {0499.10033},
     language = {en},
     url = {https://www.numdam.org/item/CM_1980__40_1_87_0/}
}
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Arthur, James. A trace formula for reductive groups. II : applications of a truncation operator. Compositio Mathematica, Tome 40 (1980) no. 1, pp. 87-121. https://www.numdam.org/item/CM_1980__40_1_87_0/

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(b) Eisenstein series and the trace formula, in Automorphic Forms, Representations and L-functions, A. M. S., 1979. | Zbl

(c) A trace formula for reductive groups I. Duke Math. J. 45 (1978) 911-952. | Zbl | MR

[2] A. Borel: Ensembles fundamentaux pour les groups arithmétiques et forms automorphes, E. N. S., 1967.

[3] Harish-Chandra: Automorphic forms on semisimple Lie groups. Springer-Verlag, 1968. | Zbl | MR

[4] R. Langlands: (a) Eisenstein series, in Algebraic groups and discontinuous subgroups. A. M. S. 1966. | MR

(b) On the functional equations satisfied by Eisenstein, series, Springer-Verlag, 1976. | Zbl | MR